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

1.	6, 18, 3, 21, 7, 56, ?
Answer» 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 Ã· 7 = 8.

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