Let XXX be a discrete random variable with PMF P(X=k)=c⋅2−kP(X = k) = c \cdot 2^{-k}P(X=k)=c⋅2−k for k=1,2,3,…k = 1, 2, 3, \ldotsk=1,2,3,…. Find ccc.
1/2
1
2
1/4