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It the first and (2n-1)^(th) terms of an...

It the first and `(2n-1)^(th)` terms of an A.P.,a G.P. and an H.P. of positive terms are equal and their `(n+1)^(th)` terms are a, b, and c respectively then

A

`a=b=c`

B

`agebgec`

C

`a+c=2b`

D

`ac=b^(2)`

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The correct Answer is:
A
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