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Let f(x) = 15 -|x-10|, x in R. Then, th...

Let ` f(x) = 15 -|x-10|, x in R`. Then, the set of all values of x, at which the function, ` g(x) = f(f(x))` is not differentiable, is

A

{5,10,15}

B

{10,15}

C

{10}

D

{5,10,15,20}

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The correct Answer is:
A
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