Question

A is a set with a finite number of elements, let n(A) denote its cardinality, defined as the number
A
of elements in A. If A and B are arbitrary finite sets, prove the following:
(a) n(AUB) = n(A) + n(B) - n(
AnB)
(b) n(
A-B) = n(A) - n(
AnB)​

Answer 1

Step-by-step explanation:

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