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View Thread: Math Quiz: 9 is number one
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    bureX said:

    There's a a^2 - ab ≠ 0 missing somewhere, I think Wink

    (by the way, I suck at math)

    if a == b, then a^2 == ab and a^2-ab==0. Division by zero is not permitted here Smiley  You can get any answer you want if you divide by zero, just as you can "prove" any proposition if you accept a contradiction, just as any statement about members of the empty set is logically true!