MCQs with Solutions for all Competitive Examinations

Number Series MCQs for Competitive Examination

What should come in place of the question mark(?) in the following number series?

Q. 1
3, 5, 9, 17, 33, ?

(A) 65
(B) 60
(C) 50
(D) 49

Answer: (A) 65
Explanation

Q. 2
3, 8, 27, 112, ?, 3396

(A) 565
(B) 452
(C) 560
(D) 678

Answer: (A) 565
Explanation

Q. 3
3, 18, 12, 72, 66, 396, ?

(A) 300
(B) 380
(C) 350
(D) 390

Answer: (D) 390
Explanation: 3*6=18, 18-6=12, 12*6=72, 72-6=66, 66*6=396, 396-6=390

Q. 4
51, 52, 56, 65, ?

(A) 75
(B) 78
(C) 78
(D) 81

Answer: (D) 81
Explanation:

Q. 5
7, 15, 31, 63, ?

(A) 95
(B) 111
(C) 123
(D) 127

Answer: (D) 127
Explanation:

Q. 6
2, 3, 6, 7, 14, ?

(A) 15
(B) 17
(C) 18
(D) 20

Answer: (A) 15
Explanation:

Q. 7
1, 9, 28, 65, 126, ?

(A) 199
(B) 205
(C) 216
(D) 217

Answer: (D) 217
Explanation:

Q. 8
1548, 516, 129, 43, ?

(A) 11
(B) 10.75
(C) 9.5
(D) 12

Answer: (B) 10.75
Explanation:

Q. 9
121, 144, 190, 259, ?, 466

(A) 351
(B) 349
(C) 374
(D) 328

Answer: (A) 351
Explanation:

Q. 10
1, 16, 81, 256, 625, 1296, ? 

(A) 4096
(B) 2401
(C) 1764
(D) 3136

Answer: (B) 2401
Explanation:

Q. 11
5, 9, 18, 34, 59, 95, ?

(A) 272
(B) 144
(C) 148
(D) 168

Answer: (B) 144
Explanation:

Q. 12
18, 20, 44, 138, 560, 2810, ?

(A) 16872
(B) 16818
(C) 16836
(D) 16890

Answer: (A) 16872
Explanation;

Q. 13
9, 17, ?, 65, 129

(A) 32
(B) 24
(C) 33
(D) 35

Answer: (C) 33
Explanation:

Q. 14
5, 6, 14, 45, ?

(A) 138
(B) 154
(C) 118
(D) 184

Answer: (D) 184
Explanation:

Q. 15
8, 12, 9, 13, 10, 14, ?

(A) 11
(B) 15
(C) 16
(D) 17

Answer: (A) 11
Explanation:

Q. 16
2, 9, 28, 65, 126, ?

(A) 195
(B) 199
(C) 207
(D) 217

Answer: (D) 217
Explanation:

Q. 17
5, 6, 15, ?, 89, 170, 291

(A) 50
(B) 40
(C) 42
(D) 32

Answer: (B) 40
Explanation:

Q. 18
5, 10, 13, 26, 29, 58, 61, ?

(A) 122
(B) 120
(C) 93
(D) 64

Answer: (A) 122
Explanation:

Q. 19
2, 6, 12, 20, 30, 42, 56, ?

(A) 60
(B) 64
(C) 70
(D) 72

Answer: (D) 72
Explanation:

Q. 20
2, 3, 5, 8, 13, 21, ?

(A) 31
(B) 34
(C) 23
(D) 25

Answer: (B) 34
Explanation:

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