Question

Hi
I will mark as brain list
Please tell me answer of this question in easy way but Step-by-step explanation ​

Answer 1

Step-by-step explanation:

hey

i have no acess to intersect button so i wi use ∆ in place of it sorry about that

your explanation :-

we know that n(X U Y) = n(X) + n(Y) - n (X ∆ Y)

so let us put X = A and Y = B

So,

29 = 15 + n(B) -7

so n(B) =21

Hope it helps