Please I want to know the answer of:

a discrete random variable X has probability function
px(x)=2ֿx (this means 2 to the power of -x), x=1,2,3,.

Calculate:
a) Pr(X is even)
b)Pr(x>5)
c)Pr(X is divisible by 3)

Hi,
Still no body know the answer :(

You've gotten an answer over here:
https://www.askmehelpdesk.com/math-sciences/probability-random-variables-414919.html

It would be useful if you didn't double-post. It sounds like you've gotten as good of an answer as you're going to get and that you possibly need more explanation than what can be given on a forum like this.