Sequences and Series
Direction: What should come in place of the question mark in each of the following number series ?
- 6, 13, 32, ?, 130, 221.
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Series pattern
13 + 5, 23 + 5, 33 + 5, 43 + 5, 53 + 5Correct Option: B
Series pattern
13 + 5, 23 + 5, 33 + 5, 43 + 5, 53 + 5
∴ Missing term = 43 + 5 = 69
- 656, 432, 320, 264, 236, ?
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Series pattern
656 - 224 = 432
432 - 112 = 320
320 - 56 = 264 .....Correct Option: A
Series pattern
656 - 224 = 432
432 - 112 = 320
320 - 56 = 264
264 - 28 = 236
236 - 14 = 222 Should come in place of '?'
- 16, 4, 2, 1.5, 1.75, 1.875
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Series pattern
16 x 0.25 = 4,
4 x 0.50 = 2,
2 x 0.75 =1.5,
1.5 x 1.00 = 1.5Correct Option: B
Series pattern
16 x 0.25 = 4,
4 x 0.50 = 2,
2 x 0.75 =1.5,
1.5 x 1.00 = 1.5
Should come in place of 1.75
1.5 x 1.25 = 1.875
Clearly, 1.75 is wrong and will be replaced by 1.5
- 7, 9, 16, 25, 41, 68, 107, 173, ?
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Series pattern
7 + 9 = 16,
9 + 16 = 25,
16 + 25 = 41,
25 + 41 = 66
Should come in place of 68Correct Option: D
Series pattern
7 + 9 = 16,
9 + 16 = 25,
16 + 25 = 41,
25 + 41 = 66
Should come in place of 68
41 + 66 = 107,
66 + 107 = 173
Clearly, 68 is wrong and will be replaced by 66.
- 2, 6, 14, 30, .... 126, ?
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Series pattern = (2 x Previous number) + 2
Correct Option: A
Series pattern = (2 x Previous number) + 2
∴ Missing term = 2 x 30 +2 = 62