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Use:
1. n(AUB) = n(A) + n(A) - n(A intersection B)
2. n(A-B) = n(A) - n(A intersection B)
3. n((AUB) - A) = n(B) - n(A intersection B)
the first one is an identity, the other 2 are through venn diagram.
1. n(AUB) = n(A) + n(A) - n(A intersection B)
2. n(A-B) = n(A) - n(A intersection B)
3. n((AUB) - A) = n(B) - n(A intersection B)
the first one is an identity, the other 2 are through venn diagram.
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