27
61
122
509
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Answer : Option A
Explanation :
The terms of the series are (23 - 3), (33 - 3), (43 - 3), (53 - 3), (63 - 3), (73 -3), (83 -3).So, 27 is wrong and must be replaced (33 - 3) i.e., 24
35
77
165
221
Answer : Option C
The terms of the series are product of two consecutive prime numbers i.e., (2 × 3), (3 × 5), (5 × 7), (7 × 11),...........So, 165 is wrong and must be replaced by (11 × 13) i.e., 143.
143
186
209
Each term in the series is obtained by adding 22 to the preceding term.So, 186 is wrong and must be replaced by (165 + 22) i.e., 187.
96
386
1536
6144
Answer : Option B
Each term of the series is obtained by dividing the preceding term by 4.So, 1536 is wrong and must be replaced by (1536 ÷ 4) i.e., 384.
30
45
52
66
The correct pattern is + 6, + 8, + 10, + 12, + 14.So, 45 is wrong and must be replaced by (30 + 10) i.e., 40.
14
48
98
194
The correct pattern is × 2, - 2.......So, 48 is wrong and must be replaced by (26 × 2 - 2) i.e., 50.
13
21
32
47
Answer : Option D
The correct pattern is + 5, + 8, + 11, + 14, ............So, 47 is wrong and must be replaced by (32 + 14) i.e., 46
26
74
218
654
The correct pattern is × 3, - 4,............So, 654 is wrong and must be replaced by (218 × 3 - 4) i.e., 650.
4
10
382
The correct pattern is + 6, + 12, + 24, + 48, + 96, + 192 ............So, 96 is wrong and must be replaced by (46 + 48) i.e., 94
129
356
The correct pattern is × 2 + 1, × 3 + 1, × 2 + 1, × 3 + 1,...........So, 356 is wrong and must be replaced by (129 × 3 + 1) i.e., 388.
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