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March 30, 2017

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How many different combinations of coins can total exactly $0.40?

I got 31 possible combinations

  • math - ,

    I only got 27

    P -N D Q
    50 0 0 0
    35 1
    30 2
    25 3
    20 4
    15 5
    10 6
    5 7
    0 8 0 0
    30 0 1 0
    25 1 1
    20 2 1
    15 3 1
    10 4 1
    5 5 1
    0 6 1 0
    20 0 2
    15 1 2
    10 2 2
    5 3 2
    0 4 2
    10 0 3
    5 1 3
    0 2 3
    0 0 4 0
    5 0 1 1
    0 1 1 1

    If you see only 3 numbers the last digit is 0

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