The p.d.f. of a r.v. X is f(x)={{:((1)/(...

The p.d.f. of a r.v. X is `f(x)={{:((1)/(x^(2))","1ltxltoo),(0", otherwise"):}`.
If `C_(1)={x : 1lt x lt 2}" and "C_(2)={x : 4lt x lt 5}`, then `P(C_(1)uuC_(2))` =

A

(a) `1/20`

B

(b) `7/20`

C

(c) `11/20`

D

(d) `13/20`

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The correct Answer is:

C

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