math

U is the set of positive integers less than or equal to 30. A is the set of natural numbers that are multiples of 5 in U. B is the subset of all of the even integers in U.

a) Find n(A U B)
b) Find n(A intersect B)
c) Find n(A U B' )
d Find n(B intersect A')

Thank you so much!!!!!

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1. well, work it out
U = {1,2,3,...,28,29,30}
A = {5,10,15,20,25,30}
B = {2,4,6,...,28,30}

Now can you find the unions and intersections? You must have some ideas here.

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