A discrete variable XXX has PMF P(X=k)=ck!P(X=k) = \frac{c}{k!}P(X=k)=k!c for k∈{0,1,2}k \in \{0, 1, 2\}k∈{0,1,2}. Find ccc.
1/2.51/2.51/2.5
2/52/52/5
1/1.51/1.51/1.5
2/32/32/3