Question

n(A)=300,n(B)=200and n(AuB)=400.find n(A-B)

Answer 1

n(A) =300
n(B)=200
n(A-B) = 300-200=100

# n(A-B)= 100
:) hope this will help you

Answer 2

Hey !

⭐Here is your answer ⭐

_________________

First find Out : n( A ∩ B )


n( A U B ) = n( A ) + n( B ) - n( A ∩ B )

400 = 300 + 200 - n( A ∩ B )

n( A ∩ B ) = 500 - 400 = 100


Now !

n( A - B ) = n( A ) - n( A ∩ B )

n( A - B ) = 300 - 100 = 200

Hence your answer is 200
_________________

Hope it helps !⭐☺