Question

i have a test tomorrow and im still not sure how to do this. can you please help me?

p={a,b,c}
Q={a,c,d,f}
Q-P=?

Answer 1

Q-P is members of Q which are not members of P, so
Q-P = {d,f}

Answer 2

Thankyou steve :)

but what about the 'b'?