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If `a ,b ,c` are first three terms of a G.P. If the harmonic mean of `aa n db` is 20 and arithmetic mean of `b & c` is 5, then no term of this G.P. is square of an integer arithmetic mean of `a ,b ,c` is 5 c. `b=+-6` d. common ratio of this G.P. is 2

A

no term of this G.P. is square of an integer

B

arithmetic mean of `a,b,c,` is `5`

C

`b = +- 6`

D

common ratio of this G.P. is 2

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A
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