Question

Select the number from among the given option that can replace the question mark (?) in the following series.

6, 31, 126, 381, 766, ?

A 731 Correct Answer Incorrect Answer
B 754 Correct Answer Incorrect Answer
C 756 Correct Answer Incorrect Answer
D 771 Correct Answer Incorrect Answer

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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