Given XXX is a discrete random variable where P(X=k)=cP(X=k) = cP(X=k)=c for k∈{10,20,30,40}k \in \{10, 20, 30, 40\}k∈{10,20,30,40}, what is the value of ccc?
0.1
0.2
0.25
0.5