7 + 1² = 8 8 + 2 2 = 12 12 + 3 2 = 21 21 + 4 2 = 37 37 + 5 2 = 62

Question

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

7, 8, 12, 21, 37, ?

A 62

B 22

C 69

D 55

E None of these

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