Question

If n(B) =40 , n(A∩B)=20 , n (AUB)=35 then find n(A)

1 point

40

20

55

15

​

Answer 1

$\huge\sf\underline\pink{Answer:-}$

Given,

n(B)=40

n(AUB)=35

n(AnB)=20

To find :-n(A)

We know that $\large\sf{\boxed{\underline{n(AUB)=n(A)+n(B)-n(AnB)}}}$

Therefore

35=n(A)+40-20

35=n(A)+20

35-20=n(A)

n(A)=15 option d