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Let 2^("nd"),8^("th") and 44^("th") term...

Let `2^("nd"),8^("th")` and `44^("th")` terms of a non-constant A.P. be respectively the `1^("st"),2^("nd")` and `3^("rd")` terms of a G.P.If the first term of the A.P. is `1` ,then the sum of its first `20` terms is equal to -

A

960

B

970

C

990

D

980

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