Question

If A={1,2,3,4} and B={3,4,5} , then n(B−A)=​

Answer 1

Answer:

B-A = 5

n(B-A) = 1

..................

Answer 2

Answer:

B-A i.e. all the elements present in B exclusively

B-A=B-(B∩A)

{1,2,3,4}-{3,4}

{1,2}

n(B-A)=2

Step-by-step explanation: