# Sequence and Series Questions for SBI Bank Clerk exam (Set-2)

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Sequence and Series Questions for SBI Bank Clerk Exam (Set-2):

Download Sequence and series banking important questions and answers PDF. Practice solved problems provided with detailed explanations for SBI clerk exam.

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Instructions (1 – 5): What should come in place of question mark (?) in the following numbers series

Question 1: 12, 6.5, 7.5, 12.75, 27.5, 71.25, ?

a) 225.75
b) 216.75
c) 209.75
d) 236.75
e) 249.75

Question 2: 16, 24, 36, 54, 81, 121.5 ?

a) 182.25
b) 174.85
c) 190.65
d) 166.55
e) 158.95

Question 3: 12, 12, 18, 45, 180, 1170, ?

a) 13485
b) 14675
c) 15890
d) 16756
e) 12285

Question 4: 22, 23, 27, 36, 52, 77, ?

a) 111
b) 109
c) 113
d) 117
e) 115

Question 5: 16, 14, 24, 66, 256, 1270, ?

a) 8564
b) 5672
c) 4561
d) 7608
e) 6340

Instructions (6 – 10): In each of these question a number series is given.In each series only one number is wrong.Find out the wrong numbers.

Question 6: 3601, 3602, 1803, 604, 154, 36, 12

a) 3602
b) 1803
c) 604
d) 154
e) 36

Question 7: 4, 12, 42, 196, 1005, 6066, 42511

a) 12
b) 42
c) 1005
d) 196
e) 6066

Question 8: 2, 8, 12, 20, 30, 42, 56

a) 8
b) 42
c) 30
d) 20
e) 12

Question 9: 32, 16, 24, 65, 210, 945, 5197.5

a) 945
b) 16
c) 24
d) 210
e) 65

Question 10: 7, 13, 25, 49, 97, 194, 385

a) 13
b) 49
c) 97
d) 194
e) 25

Answers and Solutions forÂ Sequence and Series Questions for SBI Clerk (Set-2):

The given series is based on the following sequence,
(12+1)*0.5 = 6.5
(6.5+1)*1 = 7.5
(7.5+1.5)*1.5=12.75
(12.75+1)*2 = 27.5
(27.5+1)*2.5 = 71.25
(71.25+1)*3 = 216.75

Each number in the series is 1.5 times the preceding number.
Hence, 16*1.5 = 24
24*1.5 = 36
36*1.5 = 54
54*1.5=81
81*1.5 = 121.5
So, the next number is 121.5*1.5 = 182.25

The ratio between preceding terms of the sequence are in a fibonacci sequence.
For example, 12/12 = 1
18/12 = 1.5
45/18 = 2.5 (which is 1+1.5)
180/45 = 4 (which is 1.5+2.5)
1170/180 = 6.5 (which is 2.5+4)
Hence, the next ratio would be 4+6.5=10.5
And the required number is 1170*10.5 = 12285

The difference between consecutive terms of the series is a perfect square.
For example,
23-22 = 1
27-23 = 4
36-27 = 9
52-36 = 16
77-52 = 25
Hence, the next difference between the numbers will be 36 and the required number is 77+36 = 113

The given terms are in the following series,
14 = 16*1 – 2*1
24 = 14*2 – 2*2
66 = 24*3 – 2*3
256 = 66*4 – 2*4
1270 = 66*5 – 2*5
Hence, the next term equals 1270*6 – 2*6 = 7608

In the given series, nth term is obtained by – (Previous term/(n-1) ) +(n-1).
Hence the 5th term should be (604/4)+4 = 155.
However 5th term is given as 154.
Hence, 154 is wrong term in the given series.

In this question, the nth term is obtained by (previous term*n + n^2).
Hence, after 12, the number would be (12*3+9)= 45
Therefore, the correct option is 45.

Here, in this series, the nth term is $$(previous term + 6\times 2^{n-2})$$
Hence, in place of 194 the term should be $$(97 + 6 \times 2^{4}) = 193$$