Question

If A is the set of the all prime number Less than 5 and B is the set of prime factors of 30 then find A-B= B-A

Answer 1

Sol:Let,

A= { 2,3 }

B= {2,3,5}

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

={ }

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

={5}

so , A-B is not equal to B-A