Question

2.If n(A ∩ B)=4,and n(A U B)=11 then find n(p(A∆B)) ​

Answer 1

$Verified by Toppr</p><p></p><p>n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)</p><p></p><p>Given n(A)=7</p><p></p><p>n(B)=9</p><p></p><p>n(A∪B)=14</p><p></p><p>Substituting in 1</p><p></p><p>14=7+9−n(A∩B)</p><p></p><p>⇒n(A∩B)=16−14=2</p><p></p><p>$

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