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Choose the correct option in place of question mark (?) in the following series:
51, 17, 3, 16, 48, 12, 4, 10, 40, (?), 5, 13, 65.
(a) 12
(b) 10
(c) 9
(d) 8
Solution:
3 × 17 = 51
3 × 16 = 48
4 × 12 = 48
4 × 10 = 40
8 × 5 = 40
5 × 13 = 65
Answer: 8
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