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Question

If $$n(P)=25$$ & $$n\left( P\cap Q \right) =5$$ then the value of $$ n(P-Q)$$ is


A
10
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B
15
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C
20
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D
25
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Solution

The correct option is C $$20$$
Given
$$n(P)=25$$
$$n(P\cap Q)=5$$
$$n(P-Q)=n(P)-n(P\cap Q)$$
          $$=25-5$$
          $$=20$$

Mathematics

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