78, 38, 18, .?.

Q. Find the next number...?

         78, 38, 18, .?.

(A) 34

(B) 8

(C) 12

(D) 10

ANS: = (B) 8

Details:-

8x2+2 = 18

18x2+2 = 38

38x2+2 = 78

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