Tech Mahindra Number Series Questions and Answers Quiz-1

Text solution:
Because no. are decreasing in squares.
70-4^2= 70-16= 54
54-3^2=54-9=45
45-2^2=45-4=41
41-1^2=40-1=40

 Video solution:

Text solution:
number of a = 1
number of b = 2
number of c = 3
number of d = 4
.................
..................
we know, sum of natural numbers upto n is n(n+1)/2
if we add 1 to 22 , we get = 22(22+1)/2 = 253
and 22th term in alphabet is v
after that , w
hence, next 23 terms are only w
then also , 253 to 260 we get only w
so, 260th term is w.

Video solution:

ans - 504

It is give that   is the product of the digits of .

We can see that the product , when one of the 3 digits is 0.

The numbers formed is

.

We consider only the numbers with first digit, 1 second digit 1 to 9 and third digit 1 to 9.

So we can see that the sum

 

Text solution:

Series Pattern is +3, +5, +7, +9.

So next number = 25+11 = 36

Video solution:

Explanation:

As the number of children are in arithmetic progression starting with 2, the five families have 2, 3, 4, 5, 6 kids respectively. As each children has kept the pets equal to the number of kids in the family, each family has n2 pets. So total = 22+32+42 +52 +62 = 90

 

Let the 3 numbers be a-d , a , a+d

Mean of 3 numbers = ((a-d)+(a)+(a+d))/3

= 3a/3=147

That is a=147

Mean of first two numbers is ((a-d)+a)/2 =141

d=12

third number is a+d=147+12 = 159

Answer: Option B

Explanation:

Pattern is , +5, +7, +9
Missing Number = 19+9 = 28

Answer: Option D

Explanation:

Pattern is, -1, -2, ..,.. , -5

So -3 and -4 will fill the blanks to make it a pattern.

Next number will be 17-3 = 14

Answer: Option B

Explanation:

Pattern is +5, +10, + 15, +20

Next number in the series will be 56 + 25 = 81

Answer: Option A

Explanation:

Pattern is +5, +7, +9, +11
So next number will be +13
=> 33+13 = 46