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If f(x) = (A)/(pi)(1)/(16+x^(2)),0 ltx l...

If f(x) = `(A)/(pi)(1)/(16+x^(2)),0 ltx lt oo` is a probability density function of a continuous random variable X then the value of A is ……… .

A

16

B

8

C

4

D

2

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