Let XXX have PDF f(x)=cx−2f(x) = cx^{-2}f(x)=cx−2 for x≥1x \ge 1x≥1. Find ccc such that this is a valid PDF.
c=1c = 1c=1
c=2c = 2c=2
c=1/2c = 1/2c=1/2
No valid ccc