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If A and B are finite sets, then which one of the following is the correct equation?

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If A and B are finite sets, then which one of the following is the correct equation? 

(a) n(A - B) = n(A) - n(B)

(b) n(A - B) = n(B - A)

(c) n(A - B) = n(A) - n(A ∩ B) 

(d) n(A - B) = n(B) - n(A ∩ B) 

[ n(A) denotes the number of elements in A]

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1 Answer

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Best answer

Correct option is (c) 

Explanation:

If A and B are finite sets, then 

n(A - B) = n(A) - n(A ∩ B)

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