For the set A, if n(A)=m, then n[P(A)]=?

If X=Φ then n(P(X))=?.

If A and B are two sets such that n(AuuB)=50 ,n(A)=28,n(B)=32,then find n(AnnB) .

Let '**' be the operation defined on the set Z of integer by the rule m**n=m+n+1 for all m,n in Z , write down the identity element for the operation.

For any two sets A and B prove that n(A-B)=n(A)-n(AnnB) .

If n(A')=15 , n(B)=5 , n(A nn B)=3 and n( uu ) = 30 then determine n(A) , n(A uu B) and n(A-B) where A and B are subset of a universal set U.

Find the rth term of an A.P., the sum of whose first n terms is 2n+3n^2 .

Find the value of n if ^(2n)P_3=2 xx ^nP_4

Fill in the blanks :(iii)If W_1,W_2,W_3,…..W_n are all the equally likely and simple events of any trial, then P(W_1)+P(W_2)+…..P(W_n) =____

If X~B(n,p) , then find Var(X).

If n(A)=2,then find the value of n(P(A))