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If the function f(x)=((128 a+a x)^(1/8)-...

If the function `f(x)=((128 a+a x)^(1/8)-2)/((32+b x)^(1/5)-2)` is continuous at `x=0` , then the value of `a/b` is (A) `3/5f(0)` (B) `2^(8/5)f(0)` (C) `(64)/5f(0)` (D) none of these

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