Question

Select the number from among the given option that can

6 5 1 31 31 4 2 126 126 3 3 381 381 2 4 766 766 1 5 771

replace the question mark (?) in the following series. 6, 31, 126, 381, 766, ?

A 731

B 754

C 756

D 771

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Solution