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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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