Question

If n(A) = 15, n (AUB) = 29, n(An B) = 7 then n (B) = ?​

Answer 1

Answer:

hope it will help you

Step-by-step explanation:

n(A) = 15

n(AUB) = 29

n(AnB) = 7

n(B) = ?

we know,

n(AUB) = n(A)+n(B)-n(AnB)

      29 =   15+n(B) - 7

       29 =  8+n(B)

    29-8 = n(B)

       21 = n(B)

     n(B) = 21