Question

If Ac B, n(A)=12 and n(B)=20, then the value of n (B-A) is

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Answer 1

Answer:

(B-A)=(20-12)=8

Step-by-step explanation:

.....,4

Answer 2

Answer:

Step-by-step explanation:

n(B  - A ) means no. of elements in b not in a .......so like we need to find the no :

n A + n b +  n A  INTERSECTION B .....= n A UNION B

WE WILL GET A INTERSECTION  B THEN WE CAN SUBTRACT THAT VALUE FROM n B... of elements common in both A and B set ..

USING