math

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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=?

  • math -

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

  • math -

    Thankyou steve :)

    but what about the 'b'?

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