Question
Select the number from among the given option that can
replace the question mark (?) in the following series. 6, 31, 126, 381, 766, ?Solution
6 × 5 + 1 = 31 31 × 4 + 2 = 126 126 × 3 + 3 = 381 381 × 2 + 4 = 766 766 × 1 + 5 = 771
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