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Mid Point

What is the r...

Question

What is the relation between n (A), n( B), n(A intersection B)

and n(A union B)

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Solution

n(AUB)=n(A)+n(B)-n(AnB)
n(AunionB)=n(A)+n(B)-(AintersectionB)

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n (A \cup B)

\cap

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n (A) + n (B) - n (A \cap B)

n (A) + n (B) + n (A \cap B)

n (A) n (B)

n (A) - n (B)

A \cup B = {1, 2, 3, 5, 6, 7, 9}, B = {2, 5, 7, 9}, A \cap B = {2, 5}

A, B

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A = {x : x

}

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n = 8

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