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If f(x)={{:((e^(-x)","0ltxltoo),(0", oth...

If `f(x)={{:((e^(-x)","0ltxltoo),(0", otherwise"):}`, then

A

f is a p.f.

B

f is not a p.f.

C

f is a p.d.f.

D

f is not a p.d.f.

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The correct Answer is:
B,C
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