Number Series: Bank Exam Practice Questions (SBI, IBPS, RRB, PO & Clerk)
Q. 1 3, 6, 15, 42, 123, ?
Check Solution
Ans: C
Explanation: The pattern is as follows: (previous number * 3) + (a number counting up from -3).
* 3*3 – 3 = 6
* 6*3 – 3 = 15
* 15*3 – 3 = 42
* 42*3 – 3 = 123
* 123*3 – 3 = 366
Q. 2 Find the missing number in the given series: 5, 12, 26, 54, 110, ?
Check Solution
Ans: C
Explanation: The pattern in the series is as follows:
* 12 = (5 * 2) + 2
* 26 = (12 * 2) + 2
* 54 = (26 * 2) + 2
* 110 = (54 * 2) + 2
Therefore, the next number in the series will be:
* ? = (110 * 2) + 2 = 222
Q. 3 Find the missing number in the sequence: 25, 44, 66, 91, 119, ?
Check Solution
Ans: D
Explanation: The differences between consecutive numbers in the sequence are: 19, 22, 25, 28. The differences between these differences are constant at 3. Following this pattern, the next difference should be 28 + 3 = 31. Therefore, the missing number is 119 + 31 = 150.
Correct Option: D
Q. 4 Find the missing number in the sequence: 4, 5, 12, 39, 160, ?
Check Solution
Ans: B
Explanation: The pattern is as follows:
4 * 1 + 1 = 5
5 * 2 + 2 = 12
12 * 3 + 3 = 39
39 * 4 + 4 = 160
160 * 5 + 5 = 805
Correct Option: B
Q. 5 Find the missing number in the sequence: 40, 20, 20, 30, 60, ?
Check Solution
Ans: C
Explanation: The pattern is as follows:
* 40 / 2 = 20
* 20 * 1 = 20
* 20 * 1.5 = 30
* 30 * 2 = 60
* 60 * 2.5 = 150
Correct Option: C
Q. 6 Find the missing number in the sequence: 6, 5, 9, 26, ?, 514
Check Solution
Ans: D
Explanation: The pattern is as follows:
* 6 -> 6 * 1 – 1 = 5
* 5 -> 5 * 2 – 1 = 9
* 9 -> 9 * 3 – 1 = 26
* 26 -> 26 * 4 – 1 = 103
* 103 -> 103 * 5 – 1 = 514
Correct Option: D
Q. 7 Identify the missing term in the following sequence: LP, MR, ?, OV, PX
Check Solution
Ans: C
Explanation: The sequence follows a pattern where the first letter increases alphabetically by one, and the second letter increases alphabetically by teo, starting from the first term.
LP (L+1=M, P+2=Q), MR (M+1=N, R+2=T). So the pattern should be
LP, MQ, NT (N+1=O, T+2=V), OV (O+1=P, V+2=X), PX
Therefore, the missing term is NT.
Correct Option: C
Q. 8 What should come in place of the question mark ‘?’ in the following number series? 11, 23, 47, 95, ?, 383
Check Solution
Ans: D
Explanation: The pattern in the series is as follows:
11 * 2 + 1 = 23
23 * 2 + 1 = 47
47 * 2 + 1 = 95
95 * 2 + 1 = 191
191 * 2 + 1 = 383
Q. 9 In the following number series, a wrong number is given. Find out the wrong number. 7, 14, 42, 168, 840, 5040, 30200
Check Solution
Ans: D
Explanation: The pattern in the series is as follows: 7 * 2 = 14, 14 * 3 = 42, 42 * 4 = 168, 168 * 5 = 840, 840 * 6 = 5040, 5040 * 7 = 35280. The wrong number is 30200, which should be 35280.
Q. 10 What number should replace the question mark in the following series? 3, 7, 15, 31, ?, 127, 255
Check Solution
Ans: E
Explanation: The pattern in the series is: each number is obtained by multiplying the previous number by 2 and then adding 1.
3 * 2 + 1 = 7
7 * 2 + 1 = 15
15 * 2 + 1 = 31
31 * 2 + 1 = 63
63 * 2 + 1 = 127
127 * 2 + 1 = 255
Next Chapter: Number systems
Practice: Bank Exam Questions (SBI, IBPS, RRB PO & Clerk)
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