Sau 10 years

[vineetasharma]

suppose that a random variable X has a continuous distribution with the following probability function.
F(x)= ce^-2x for x>0
          0                otherwise
The probability of the event X+2= e^-2 is
a)e^-2
b) e^-2-e^-4
c) e^-4-e^-2
d) 0