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If `a ,b ,a n dc` are in G.P. and `x a n d y ,` respectively, be arithmetic means between `a ,b ,a n db ,c ,t h e n` (a) `a/x+c/y=2` b. `a/x+c/y=c/a` c. `1/x+1/y=2/b` d. `1/x+1/y=2/(a c)`

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