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1. 6, 18, 3, 21, 7, 56, ?
Thus, if the missing term be x, then we have : 7 x x = 56 or x = 56 ÷ 7 = 8.
Solution:
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 ÷ 7 = 8.