If 1 + 2 = 5, 2 + 3 = 13, 3 + 4 = 25 then 2 + 4 = ?

If 1 + 2 = 5, 2 + 3 = 13, 3 + 4 = 25 then 2 + 4 = ?

A. 8

B. 15

C. 20

D. 6

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