Instructions

What will come in place of the question mark (?) in each of the following number series.

Question 125

31, 15, 21, 50, ?, 767.25

Solution

The pattern followed is :

31 $$\times 0.5 - 0.5$$ = 15

15 $$\times 1.5 - 1.5$$ = 21

21 $$\times 2.5 - 2.5$$ = 50

50 $$\times 3.5 - 3.5$$ = 171.5

171.5 $$\times 4.5 - 4.5$$ = 767.25

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