Instructions

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

Question 87

10, 15, 30, 75, ?, 787.5

Solution

The pattern followed is :

10 $$\times \frac{3}{2}$$ = 15

15 $$\times \frac{4}{2}$$ = 30

30 $$\times \frac{5}{2}$$ = 75

75 $$\times \frac{6}{2}$$ = 225

225 $$\times \frac{7}{2}$$ = 787.5

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