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If `a_1, a_2............` are in G.P, such that `a_1=1/8, a_1nea_2` and every term is equal to arithmetic mean of it's two successive terms then find `S_20-S_18`

A

`2^(15)`

B

`-2^(18)`

C

`2^(18)`

D

`-2^(15)`

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The correct Answer is:
D
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