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If 1/(b-a)+1/(b-c)=1/a+1/c , then (A). a...

If `1/(b-a)+1/(b-c)=1/a+1/c ,` then (A). `a ,b ,a n dc` are in H.P. (B). `a ,b ,a n dc` are in A.P. (C). `b=a+c` (D). `3a=b+c`

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