Question 39

Select the correct option that will complete the series.
1, 3, 9, 31, ____, 651

Solution

$$1\times1+2 = 1+2 = 3$$

$$3\times2+3 = 6+3 = 9$$

$$9\times3+4 = 27+4 = 31$$

$$31\times4+5 = 124+5 = 129$$

$$129\times5+6 = 645+6 = 651$$

Hence 651 will come in place of blank to complete the series.

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