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Let f(x)=15-|x-10| and g(x)=f(f(x)) then...

Let `f(x)=15-|x-10|` and `g(x)=f(f(x))` then `g(x)` is non differentiable at

A

`{5,10,15}`

B

`{5,10,15,20}`

C

`{10}`

D

`{5,15}`

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A
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