Question

1,2,4,8, , , , 128, , ,

Answer 1

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$\mathfrak{The\:Answer\:is}$

a = 1

r = 4/2 = 2

B/C

128 = a * r ^ n-1

=> 128 = 1 * 2 ^ n-1

=> 2^n * 2^1 = 128

=> 2^n = 64

=> 2^n = 2^6

=> n = 6

$\boxed{Hope\:This\:Helps}$

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