Question

if n ( A ) = 5 ,n (A union B) = 8, n (A intersection B ) = 2 then find n (B)​

Answer 1

Answer:

n(B) = 5

Step-by-step explanation:

Given,

n(A) = 5

N(A ∪ B) = 8

n(A ∩ B) = 2

n(B) = ?

n(A ∪ B) = n(A) + n(B) - n(A ∩ B)  /   n(A ∩ B) = n(A) + n(B) - n(A ∪ B)

8 = 5 + n(B) - 2

-n(B) = 5 - 2 - 8

-n(B) = 5

n(B) = 5

Answer 2

Step-by-step explanation:

if n ( A ) = 5 ,n (A union B) = 8, n (A intersection B ) = 2 then find n (B) =5