MCQs with Solutions for all Competitive Examinations

Series Completion Reasoning MCQs for Competitive Examination

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

Q. 1
5, 8, 20, 34, 76, 142, ?

(A) 284
(B) 302
(C) 296
(D) 272

Answer: (C) 296
Explanation: 5*2-2, 8*2+4, 20*2-6, 34*2+8, 76*2-10, 142*2+12

Q. 2
5, 9, 18, 43, 92, 213, 382, ?

(A) 328
(B) 617
(C) 382
(D) 671

Answer: (D) 671
Explanation: 5+2², 9+3², 18+5², 43+7², 92+11², 213+13², 382+17²…(2, 3, 5, 7, 11, 13, 17, …are being consecutive prime numbers.

Q. 3
4, 10, 27, 140, ?

(A) 379
(B) 973
(C) 937
(D) 397

Answer: (B) 973
Explanation: 4*2+2, 10*3–3, 27*5+5, 140*7-7

Q. 4
3, 27, 243, 2187, ?

(A) 27139
(B) 13561
(C) 21377
(D) 19683

Answer: (D) 19683
Explanation: 3, 3*9, 27*9, 243*9, 2187*9

Q. 5
3, 14, 29, 38, 51, 58, 69, ?

(A) 74
(B) 37
(C) 73
(D) 47

Answer: (A) 74
Explanation: N/A

Q. 6
6, 24, 60, 120, ?

(A) 216
(B) 240
(C) 210
(D) 186

Answer: (C) 210
Explanation: 1*2*3=6, 2*3*4=24, 3*4*5=60, 4*5*6=120, 5*6*7=210

Q. 7
16, 30, 62, 122, 246, ?

(A) 490
(B) 488
(C) 492
(D) 494

Answer: (A) 490
Explanation: 16*2-2, 30*2+2, 62*2-2, 122*2+2, 246*2-2

Q. 8
7, 11, ? , 31, 47

(A) 29
(B) 55
(C) 5
(D) 19

Answer: (D) 19
Explanation: 2*2+2, 6*2+2, 14*2+2, 30*2+2, 62*2+2

Q. 9
2, 6, 14, 30, 62, ?

(A) 122
(B) 98
(C) 134
(D) 126

Answer: (D) 126
Explanation: N/A

Q. 10
4, 16, 36, 64, 100, 144, 196, ?

(A) 256
(B) 284
(C) 225
(D) 246

Answer: (A) 256
Explanation: 2², 4², 6², 8², 10², 12², 14², 16²

Q. 11
16, 18, 21, 26, 33, ?

(A) 46
(B) 44
(C) 45
(D) 43

Answer: (B) 44
Explanation: N/A

Q. 12
20, 10, 10, 15, 30, ?

(A) 45
(B) 90
(C) 60
(D) 75

Answer: (D) 75
Explanation; (10/20)=0.5, (10/10)=1, (15/10)=1.5, (30/15)=2

Q. 13
28, 32, 41, 57, 82, ?

(A) 120
(B) 118
(C) 116
(D) 122

Answer: (B) 118
Explanation: N/A

Q. 14
25, 42, 67, 101, 145, ?

(A) 200
(B)199
(C) 201
(D) 202

Answer: (A) 200
Explanation: N/A

Q. 15
55, 56, 64, 91, 155, ?

(A) 265
(B) 275
(C) 280
(D) 270

Answer: (C) 280
Explanation: N/A

Q. 16
77, 92, 125, 178, 253, ?

(A) 350
(B) 352
(C) 353
(D) 351

Answer: (B) 352
Explanation: N/A

Q. 17
6, 10, 26, 62, ?

(A) 92
(B) 126
(C) 216
(D) 112

Answer: (B) 126
Explanation: N/A

Q. 18
12, 22, 42, 72, ?

(A) 102
(B) 112
(C) 92
(D) 122

Answer: (B) 112
Explanation: N/A

Q. 19
2, 4, 7, 12, 19, 30, ?

(A) 38
(B) 47
(C) 43
(D) 36

Answer: (C) 43
Explanation: N/A

Q. 20
19, 9, 28, 37, 65, ?

(A) 99
(B) 97
(C) 102
(D) 113

Answer: (C) 102
Explanation: 19+9=28, 28+9=37, 28+37=65, 37+65=102

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