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 If an+1=2nan and a1=1, then log2a100 is equal to 

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a
5050
b
4950
c
1020
d
5150

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detailed solution

Correct option is B

a100=299⋅a99=299⋅298⋅a98=299+98+...+1⇒log2a100=99+98+97+...+1=99×1002=4950


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