Question

verify the result n(A unionB)=n(A)+n(B)-n(A intersection B)​

Answer 1

♡[Answer]♡

Here from vendiagram

= n(a-b) =n(anb)

And, n(b-a) =n(b)-n(anb)

Again from vendiagram we get 1 formula

= n(aub) =n(a-b)+n(b-a)+n(a-b)

= n(aub) =n(a)+n(b)-n(anb) [putting the value of n(a-b),n(b-a)]

Hence, proved

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