IBM Number Series Questions & Answers For Freshers | Number Series Placement Paper Question And Answers In IBM: You've come to the right place if you're a student looking for the greatest learning platform to get a career. The IBM Number Series Questions and Answers with Explanation are presented on this page.

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## IBM Number Series Questions & Answers For Freshers Complete Overview

• Number of Questions: 18
• Time Limit: 40 mins
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## IBM Number Series Questions & Answers Given Below

Competitors who enjoy solving problems and taking on new challenges may put their skills to the test by practicing IBM Number Series Questions and Solutions. To get the most points, applicants must be able to answer all of the questions.

1. 1.5, 2.3, 3.1, ?, 4.7

A. 3.2
B. 3.4
C. 3.7
D. 3.9

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

2. 544, 509, 474, 439, ?

A. 420
B. 404
C. 414
D. 445

Explanation: If you observe, Each number is 35 less than the previous number.

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

A. 41
B. 61
C. 52
D. 31

Explanation:
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.

4. Find the wrong number in the given sequence
10, 5, 19, 12, 39, 26, 73, 54

A. 19
B. 39
C. 5
D. 26

Explanation:
The sequence is a combination of the following two series:
I. 10, 19, 39, 73, and II. 5, 12, 26, 54
The pattern in I becomes + 9, + 18, + 36
According to the series, 37 is the correct number.
Hence, 39 is the wrong number

5. 5, 21, 69, 213, 645, ?

A. 1935
B. 1815
C. 1941
D. 1290

Explanation:
5
5 x 3 + 6 = 21
21 x 3 + 6 = 69
69 x 3 + 6 = 213
213 x 3 + 6 = 645
645 x 3 + 6 = 1941.
Therefore, the next number in the series is 1941.

6. 496, 492, 483, 467, ?

A. 431
B. 462
C. 437
D. 442

Explanation:
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.

7. 8(97)6, 4(56)5, 6(75)4, 7(?)8

A. 98
B. 89
C. 88
D. 97

Explanation:
If we observe, In 8(97)6 we can have 97- 86 = 11
4(56)5 we can have 56 – 45 = 11
6(75)4 we can have 75 – 64 = 11
So, the difference is 11.
? – 78 = 11
Hence, ? = 78+11 = 89

8. 2, 1, (1/2), (1/4), ?

A. (1/8)
B. (2/8)
C. (1/16)
D. (1/3)

Explanation:
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.
2
2/2 = 1
1/2 = 1/2
(1/2)/2 = 1/4
(1/4)/2 = 1/8
So, ? is (1/8).

9. Find the wrong number in the given series
1, 125, 729, 2177

A. 1
B. 125
C. 729
D. 2177

Explanation:
Given 1, 125, 729, 2177
Let’s assume 1 = 13 , 125 = 53, 729 = 93.
However, the number difference is 40
So, the next number would be 133= 2197
Therefore, 2177 is wrong.

10. 1023, 987, 915, 807, ?

A. 563
B. 543
C. 636
D. 663

Explanation:
1023 – 36 = 987
987 – 72 = 915
915 – 108 = 807
807 – 144 = 663

11. 460, 92, 36.8, 22.08, ?

A. 17.664
B. 18.44
C. 16.33
D. 10.56

Explanation:
460*(1/5) = 92
92*(2/5) = 36.8
36.8*(3/5) = 22.08
22.08*(4/5) = 17.664

12. 8, 4, 4, 6, 12, ?

A. 39
B. 27
C. 24
D. 30

Explanation:
8*(1/2) = 4
4*(1) = 4
4*(3/2) = 6
6*(2) = 12
12*(5/2) = 30

13. 15 , 22, 72, 552 , ?

A. 8800
B. 4763
C. 4500
D. 4592

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

14. 69, 77.28, 86.55, 96.936, ?

A. 102.546
B. 108.568
C. 105.675
D. 119.876

Explanation:
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

15. 980, 147, 28, 11, 8.57, ?

A. 10.765
B. 8.224
C. 5.675
D. 12.653

Explanation:
980/7 + 7 = 147
147/7 +7 = 28
28/7 + 7 = 11
11/7 + 7 = 8.57
8.57 /7 +7 = 8.224

16. 10 16.5 43.75 156.625 ?

A. 709.3125
B. 809.3125
C. 699.3125
D. 609.3125
E. None of these

Explanation:
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

17. 100 125 225 450 850 ?

A. 1375
B. 1275
C. 1475
D. 1575
E. None of these

Explanation :
100 + 5^2 = 125
125 + 10^2 = 225
225 + 15^2 = 450
450 + 20^2 = 850
850 + 25^2 = 1475

18. 460, 92, 36.8, 22.08, ?

A. 17.664
B. 18.44
C. 16.33
D. 10.56