How to crack Tcs Ninja test

How many 2’s are there between the terms 112 to 375?

Answer: c
Explanation:
Let us calculate total 2’s in the units place. (122, 132, 142 … 192), (201, 212, 222, … 292), (302, 312, … 372) = 8 + 10 + 8 = 26
Total 2’s in tenth’s place, (120, 121, 122, …, 129) + (220, 221, …, 229) + (320, 321, …, 329) = 30
Total 2’s in hundred’s place = (200, 201, … 299) = 100.
Total 2’s between 112 and 375 = 26 + 30 + 100 = 156

Three generous friends, each with some money, redistribute the money as follows: Sandra gives enough money to David and Mary to double the amount of money each has. David then gives enough to Sandra and Mary to double their amounts. Finally, Mary gives enough to Sandra and David to double their amounts. If Mary had 11 rupees at the beginning and 17 rupees at the end, what is the total amount that all three friends have?

Answer:
Explanation:
Let Sandra, David and Mary each has s, d and 11 respectively.
After the first distribution,
David has d + d = 2d, Mary has 11 + 11 = 22 and Sandra has s – d – 11.
After the second distribution,
Sandra has 2×(s – d – 11) , mary has 2×22 = 44 and david has 2d – (s – d – 11) – 22=3d – s –11.
After the third distribution,
Sandra has 2×2(s – d – 11), david has 2×(3d – s – 11) and mary has 44 – 2(s – d – 11) – (3d – s – 11) = 77 – s – d
It is given that finally Mary has Rs.17. So, 77 – s – d=17
⇒ s + d = 60
⇒ s + d + 11 = 60 + 11 = 71.

Apples cost L rupees per kilogram for the first 30 kilograms and Q per kilogram for each additional kilogram.  If the price paid for 33 kilograms of Apples is Rs.1167 and for 36 kilograms of apples if Rs.1284, then the cost of the first 10 kgs of apples is:
a. Rs.117
b. Rs.350
c. Rs.281
d. Rs.1053
Answer: b
Explanation:
Given that
30L + 3Q = 1167
30L + 6Q = 1284
Solving we get Q =  39, L = 35
So cost of first 10 kgs of apples = 35 × 10 = 350

A bag contains 1100 tickets numbered 1, 2, 3, … 1100.  If a ticket is drawn out of it at random, what is the probability that the ticket drawn has the digit 2 appearing on it?
a. 291/1100
b. 292/1100
c. 290/1100
d. 301/1100
Answer: c
Explanation:
Numbers which dont have 2 from 1 to 9 = 8
Numbers which don’t have 2 from 10 to 99:
Let us take two places  _ _. Now left most place is fixed in 8 ways. Units place is filled with 9 ways. Total 72 numbers.
Numbers which don’t have 2 from 100 to 999 =_ _ _ = 8 × 9 × 9 = 648
Numbers which don’t have 2 from 1000 to 1099 =10_ _ = 9 × 9 = 81
Finally 1100 does not have 2. So 1.
Total number with no 2 in them = 8 + 72 + 648 + 81 + 1= 810
Tickets with 2 in them = 1100 – 810 = 290
Required probability = 290 / 1100

Five college students met at a party and exchanged gossips. Uma said, “Only one of us is lying”. David said, “Exactly two of us are lying”. Thara said, “Exactly 3 of us are lying”. Querishi said, “Exactly 4 of us are lying”. Chitra said “All of us are lying”. Which one was telling the truth? 
a)David 
b)Querishi 
c)Chitra 
d)Thara
Sol:  As all are contradictory statements, it is clear that ONLY one of them is telling the truth. So remaining 4 of them are lying. Querishi mentioned that exactly 4 are lying. So, he is telling the truth.
Explanation: Let us 1st assume that Uma is telling the truth. Then according to her only one is lying. But if only one is lying then all the others’ statements are contradicting the possibility. If we assume the Querishi is telling the truth, according to him exactly 4 members are lying. So all the others are telling lies and he is the one who is telling the truth. This case fits perfectly.

What is the 32nd word of “WAITING” in a dictionary?
Sol: Arranging the words of waiting in Alphabetical Order : A,G,I,I,N,T,W
Start with A_ _ _ _ _ _ This can be arranged in 6!/2! ways=720/2=360 ways
so can’t be arranged starting with A alone as it is asking for 32nd word so it is out of range
AG_ _ _ _ _then the remaining letters can be arranged in 5!/2! ways so,120/2=60 ways.  Out of range as it has to be within 32 words.
AGI_ _ _ _ Now the remaining letters can be arranged in 4! ways =24
AGN _ _ _ _ can be arranged in 4!/2! ways or 12 ways
so,24+12 =36th word so out of range. So we should not consider all the words start with AGN
now AGNI_ _ _can be arranged in 3! ways =6 ways
so 24+6=30 within range
Now only two word left so, arrange in alphabetical order.
AGNTIIW  – 31st word
AGNTIWI  – 32nd word

George can do a piece of work in 8 hours. Paul can do the same work in 10 hours, Hari can do the same work in 12 hours.  George, paul and hari start the same work at 9 am, while george stops at 11 am, the remaining two complete the work. What time will the work complete?
a) 11.30 am
b) 12 noon
c) 12.30 pm
d) 1 pm
Let the total work = 120 units. 
As George completes this entire work in 8 hours, his capacity is 15 units /hour
Similarly, the capacity of paul is 12 units / hour
the capacity of Hari is 10 units / hour
All 3 started at 9 am and worked upto 11 am. So total work done upto 11 am = 2 x (15 + 12 + 10) = 74
Remaining work = 120 – 74 = 46
Now this work is to be done by paul and hari.  46 / (12 + 10) = 2 hours (approx)
So work gets completed at 1 pm

English Verbal

There used to be email writing section which isn’t there any more.

Now English section is there which has 10 mins for 10 questions.

Most asked email Writing Questions

Directions:
1. Use all the phrases given
2. Minimum words should be 50 otherwise your email cannot be validated
3. Addressing and signing should be done as in the question given.
4. Common grammatical rules, punctuation should be according to standard English.
5. you can use your own phrases along with the phrases given.

Email:

As a former student, write an email to your professor, Mr.Matt, thanking her for teaching and guidance that contributed to your overall development. Sign the email as peter.
Outline:
Successful – Placed – grateful – help – advice – grooming – values – shaping my future – sincere – professional

Answer

Dear Mr.Matt
I am very happy to tell you that I got successful in the recently conducted campus placement drive at my college. I am placed with TCS. I am extremely grateful for your help regarding my preparation. More over your advice regarding personality development helped for my personal grooming. In addition to that, your style of teaching inculcates not only those skills related to professional success but also for developing values which I believe helps for shaping my career. Once again I would like to thanks for your sincere and professional help.
with warm regards
Peter.

Other TCS email Writing Questions

Directions:
1. Use all the phrases given
2. Minimum words should be 50 otherwise your email cannot be validated
3. Addressing and signing should be done as in the question given.
4. Common grammatical rules, punctuation should be according to standard English.
5. you can use your own phrases along with the phrases given.

Email:

As a recent buyer of their car, write an email to the Manager of Smart Automotive company, Mr.Ahmed, regarding the poor quality of service facility available in the city. Sign the email as Chopra.
Outline:
very few – service centers – complaints – pending problems – maintenance – cost – time – delivery – increase – customer satisfaction

Dear Mr Ahmed
I recently bought Fiat Palio from “Sridhar Fiat showroom” in Nagole. Recently I faced a small problem with car AC and bought the car for maintenance. But to my utter surprise, the showroom staff told me that service is not available in their showroom and they asked me to take the car to a nearby service centre. I found that there are very few service centres available compared to sales showrooms, and there are many complaints regarding this. This, in turn, is causing many pending problems and increased maintenance cost, time and delivery time. I would like to suggest you that if more service centres are opened in the city, customer satisfaction also goes up which finally converts into more sales.
Thanks and Regards
Chopra

This section earlier used to have command line programming but that has been removed and you can code in any language of your choice. ie. C, C++, Java, Python, Perl

But command line programming is important as 1 – 2 questions in programming logic section will be from here.

The Coding section questions are available on our TCS Ninja Coding Dashboard.

Most asked Command Line Programming Questions

Binary to Decimal

#include

int main(int argc, char *argv[]) {

int num,binary,decimal=0,rem,base=1;

num=atoi(argv[1]);

binary=num;

while(num>0) {

rem=num%2;

decimal =rem*base;

num=num/10;

base=base*2;

}

printf(“%d”,decimal);

return 0;

}

Reverse Digits

Most asked C MCQ Questions in TCS. these were asked more than 30 times –

For a typical program, the input is taken using
a) scanf
b) Files
c) Command-line
d) All of the mentioned

Where are the local variable stored ?
a) In a Queue
b) In stack Memory
c) In hard Disk
d) In heap Memory

What will be the output 
#include
{
float f = 0.1;
if (f == 0.1)
printf(“YES\n”);
else
printf(“NO\n”);
return 0;
}
Output: NO

What is the output of this C code?

#include

void main()

{

int k = 5;

int *p = &k;

int **m = &p;

printf(“%d%d%d\n”, k, *p, **p);

}

a) 5 5 5

b) 5 5 junk

c) 5 junk junk

d) Compile time error