Solved: a) Give a formula for the number of elements in
Chapter 10, Problem 11RQ(choose chapter or problem)
Problem 11RQ
a) Give a formula for the number of elements in the union of four sets and explain why it is valid.
b) Suppose the sets A1, A2 , A3, and A4 each contain 25 elements, the intersection of any two of these sets contains 5 elements, the intersection of any three of these sets contains 2 elements, and 1 element is in all four of the sets. How many elements are in the union of the four sets?
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