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If `1/(sqrt(b)+sqrt(c)),1/(sqrt(c)+sqrt(a)),1/(sqrt(a)+sqrt(b))` are in `A.P.` , then `9^(ax+1),9^(bx+1),9^(cx+1),x !=0` are in

A

GP.

B

GP.only if `x lt 0`

C

GP. Only if `x gt 0`

D

None of these

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The correct Answer is:
D
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DISHA PUBLICATION-SEQUENCES AND SERIES -EXERCISE -1 : Concept Builder
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