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23x17 in expanded algorithm

  • math -

    21 = 3x7
    140 = 20x7
    3 = 3x1
    20 = 20x1

    Now, I had never heard of this method. I did a google and found lots of examples. Seems like you could have made a similar effort before asking someone else to solve your problem.

  • math -

    oops. and I got it wrong, too. Can you fix it?

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