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Question

6, 18, 3, 21, 7, 56, ?

A
8
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B
9
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C
63
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D
64
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Solution

The correct option is A 8
Each term at an even place in the series is the product of its two adjacent terms.
Thus, if the missing term be x, then we have : 7 x x = 56 or x = 56 ¯A 7 = 8.

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