IBM Number Series Questions And Answer

IBM NUMBER SERIES AND LOGICAL ABILITY

Here you will get IBM Number Series and Logical Ability Questions and Answers.In IBM Number Series and Logical ability paper you will get 38 minutes to solve the questions.The difficulty Level of the IBM Number series and logical ability test paper is Medium.You will get all the IBM Number Series and Logical ability PDF,previous year similar pattern questions of number series.

IBM Written Test	No of Questions	Time
Number Series and Logical Ability Questions	18 Ques	38 mins

Topics

Time Duration

38 mins

Adaptive

Negative Marking

IBM Number Series

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IBM Number Series Syllabus

IBM number series questions with solutions pdf

Tips for this section –

Number of Questions:18 Questions
Difficulty Level: Moderate
Importance: High
Suggested time to solve one question: 2 min 15 sec

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Preparation Section

IBM Number series questions and answers 2019-2020

Ibm number series questions with solutions pdf

Q1.496, 492, 483, 467, ?

Solution:-442

496 – 492 = 4 = 22
492 – 483 = 9 = 32
483 – 467 = 16 = 42
So, the next has to be a difference of 25 = 52
467 – 25 = 442
Therefore, the next number in the given series is 442.

Q2.Look at this series: 80, 10, 70, 15, 60, ... What number should come next?

Solution:-A

here 1,3,5............... terms are Â decreasing by 10

and 2,4,6,8................ are being increased by 5

so 6th term = 15 5=20;

Q3.Find the number that can be put in place of the question mark.
3 7 14 23 36 49 ? 83 104

Solution:-B

7-3=4 4*4=16 16-2=14
36-23=13 13*4=52 52-3=49
83-56=27 27*4=108 108-4=104

Q4.Find the wrong number in the given series.3, 4, 10, 32, 136, 685, 4116

10
32
136
4116

Solution:-The sequence is as follows :

2nd term = (1st term 1) * 1

3rd term = (2nd term 1) * 2

4th term = (3rd term 1) * 3 and so on.

So, 32 is wrong and must be replaced by (10 1) * 3Â i.e. 33.

Q5. 1.5, 2.3, 3.1, ?, 4.7

Solution:-D. 3.9

However, In this simple addition series, each number increases by 0.8.

Q6.Find the number that can be put in place of the question mark.?

8,5,9,7,2,25,5,1,16,8,6,?

Solution:-B

8-5=3 ->3^2=9

7-2=5 ->5^2=25

5-1=4 ->4^2=16

8-6=2 ->2^2=4

Q7. Find the wrong number in the given sequence
31, 2, 41, 3, 52, 4, 61, 5, 71, 6

Solution:- C

In this sequence, there is a combination of two given series:
I. 31, 41, 52, 61, 71 and II. 2, 3, 4, 5, 6
Here, the pattern in I is + 10
Therefore, 52 is wrong and should be replaced by the previous number 41+10 = 51.

Q8. 15 , 22, 72, 552 , ?

8800
4763
4500
4592

Solution:- A.8800

15×2 – 8 = 22
22×4 – 16 = 72
72×8 – 24 = 552
552×16 – 32 = 8800

Q9. 69, 77.28, 86.55, 96.936, ?

102.546
108.568
105.675
119.876

Solution:-B

69 + (12*69/100) = 69 + 8.28 = 77.28
77.28 + (12*77.28/100) = 77.28 + 9.27 = 86.55
86.55 + (12*86.55/100) = 86.55 +10.386 = 96.936
96.936 + 11.632 = 108.568

Q10. 10 16.5 43.75 156.625 ?

709.3125
809.3125
699.3125
609.3125
None of these

Solution-A

10*1.5 + 1.5 = 16.5
16.5*2.5 + 2.5 = 43.75
43.75*3.5 + 3.5 = 156.625
156.625*4.5 + 4.5 = 709.3125

Q11.Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?

1/3
1/8
2/8
1/16

Solution:-This is a simple division series; each number is one-half of the previous number. In other terms to say, the number is divided by 2 successively to get the next result.

4/2 = 2

2/2 = 1

1/2 = 1/2

(1/2)/2 = 1/4

(1/4)/2 = 1/8 and so on.

Q12.Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?

Solution:-B

In this series, each number is repeated, then 13 is subtracted to arrive at the next number.

Q13. 3, 12, 8, 19, 13, 32, 18, 42, 23, 52

12
19
42
32
None of the above

Solution:-B

The sequence is a combination of following two series:
I. 3, 8, 13, 18, 23 and II. 12, 19, 32, 42, 52
The pattern in I has a constant difference of +5, and the pattern in II has a constant difference of +10. So, in II, 19 is wrong and should be replaced by (12+10) i.e. 22

Q14. 1, 125, 729, 2177

2177
729
125
1
121

Solution:-A

1, 125, 729, 2177
1 = 1³ , 125 = 5³, 729 = 9³. So, next number would be 13³= 2197
Therefore, 2177 is wrong.

Q15. 21, 35, 56, 91, 154, ?

273
289
231
240
245

Solution:- A

21 × 2 – 7 = 35
35 × 2 – 14 = 56
56 × 2 – 21 = 91
91 × 2 – 28 = 154
154 × 2 – 35 = 273

Q16. 5, 7, 25, 131, ?, 8335

865
914
1025
802
925

Solution:- E

5 × 1 + 2 = 7
7 × 3 + 4 = 25
25 × 5 + 6 = 131
131 × 7 + 8 = 925
925 × 9 + 10 = 8335

Q17. 5, 8, 28, 162, ?, 12870

1738
2318
2224
2950
1288

Solution:- C

×2 – 2, ×4 – 4, ×6 – 6, ×8 – 8, ×10 – 10.

Q18. 11, 6, 5, 9, 16, ?

66.5
78.5
89.5
42.5
31.5

Solution:- D

11 ×0.5 + 0.5 = 6
6 ×1 – 1 = 5
5 ×1.5 + 1.5 = 9
9 ×1 – 1 = 16
16 ×2.5 + 2.5 = 42.5

Q19. 17.5 31 58 98.5 152.5

180.5
220
205
None of these
169.5

Solution:- C

Q20. 2 13 27 113 561 3369 23581

Solution:- C

Student Experience for IBM

Name: Raman Raghav
College: Vellore Institute of Technology, Chennai
Branch: Computer Science
Type of interview: Off-Campus Interview

Student Interview

I applied for the IBM off campus drive with a referral code. One of my relatives is placed in IBM Kolkata as the Software Engineer. I sent him my details and documents, and he provided me the IBM referral code through which I applied for the interview. I opted for the post of System Engineer at Global Business Services (GBS). I received an invitation email from IBM to attend the placement drive.

Written Round

There were three sections in the written paper,

Quantitative Ability
Number Series
Business Communication Test

There were 18 questions on the Quantitative Ability and 18 questions on the Number series. There was a time limit of 2 min 15 seconds for every question and if the time limit exceeds the question will be auto-submitted. The difficulty level of the questions was moderate to high. The PrepInsta practice papers were a great help while preparing for these sections. In the Business Communication Test, there were 22 MCQ questions and the total time limit was 20 minutes. The difficulty level of all the questions was moderate. There were no reading comprehension passages. Instead, there were questions related to active /passive voice, synonyms, antonyms, and fill in the blanks. There were some questions related to effective email writing.

After clearing the Written Round, I was selected for the face to face interview.

Face to Face Interview

I reached the Bangalore campus for the interview rounds. There I was informed that there would be two face to face interview rounds:

Technical Round
HR Round

Technical Round

I was very nervous before the interview, as only the candidates who cleared this round would be shortlisted for the HR round. My cousin told me to prepare well for this round and be thorough with the resume. As I entered the cabin, the interviewer was seated there. He asked me for my resume. I handed over my resume to him, and he started asking questions related to C, C++, and database.

What are linear and non-linear data structures?
What is an inner join and an outer join?
Write the logic of merge sort.
What is an LRU cache?
Is this tree BST or not?
Explain your final year project
Can you draw an ER diagram of the project?
Is there any difference between having and where clause?
Explain the ACID properties.
Write the query to print duplicate rows in a table.

The interview continued for an hour. I was hoping for a positive result. The results for the Technical round were declared, and I cleared this round and moved further for the final round.

HR Round

After the technical round, I was quite confident for this round. I entered the cabin and greeted the HR. He asked me general questions related to my interests, career plans, etc.

Introduce yourself?
You had a gap of eight months after your graduation, what were you doing?
Why do you want to join IBM?
Any plans of doing M.B.A. or Mtech?
Rate yourself on a scale of 1 – 10 in teamwork.
Where do you see yourself in next two years?

The interview continued for 15 minutes. I was asked to submit the Xerox copies of my documents for further verifications. After a week I received an email from IBM that I have been selected for the profile of System Engineer. That was the happiest day of my life.