Question

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

Answer 1

A={1, 2,3,4} B={3,4,5}

B-A = {3,4,5}-{1,2,3,4}

= {5}

n{B-A} = 1

Answer 2

A = {1 , 2 , 3 , 4}

B = { 3 , 4 , 5}

B - A = {3 , 4 , 5} - {1 , 2 , 3 , 4}

B - A = { 5 }

⭐ n(B - A) = $\sf\green{ 1 }$⭐