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If a , x ,a n db are in A.P., a ,y ,a n ...

If `a , x ,a n db` are in A.P., `a ,y ,a n db` are in G.P., and `a ,z ,b` are in H.P. such that `x=9za n da >0,b >0` , then `|y|=3z` b.`x=3|y|` c. `2y=x+z` d. none of these

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