20, 10, 10, 20, 80, ………. (a) 320 (b) 640 (c) 400 (d) 80 – InterviewSolution

1.

20, 10, 10, 20, 80, ………. (a) 320 (b) 640 (c) 400 (d) 80

Answer»

Correct option is : (b) 640

20, 10, 10, 20, 80, ……………

20, 20 × 2^-1 , 10 × 2⁰, 10 × 2¹ , 20 × 2² ,

So, next number is 80 × 2³ = 80 × 8 = 640

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