Question

if n (a) =20,n(b)=28and n (A U B)=36 then n (A B) =?
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Answer 1

Answer:

8

Step-by-step explanation:

n(a)=2*2*5

n(b)=2*2*7

n(AUB)=36

n(A B)=n(AUB)- n(b)

Answer 2

Answer:

If n (a) =20,n(b)=28and n (A U B)=36 then n (A ∩ B) = 12

Step-by-step explanation:

Given :

n (A) = 20,  

n (B) = 28  

and n (A ∪ B) = 36.  

Formula:

n (A ∩ B) =n(A) + n(B) - n (A ∪ B)  

= 20 + 28 - 36.  

∴ n (A ∩ B ) = 12