Cardinal Number Problems

Cardinal number of Sets

The cardinal number of the set containing letters of the word MOONROCK

The cardinal number of the set containing letters of the word 'GINGERCOOK ' is 8.

If a set has 510 non-empty proper subsets, then find the cardinal number of the set.

If n(A)=7,n(B)=11 and n(A uu B)>=13 then the cardinal number of the set of exhaustive value of n(A nn B) is

The cardinal number of a set is 5. find the cardinal number of the power set.