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goldenwolf13

  • one year ago

please help if no digit may be used more than once how many 2 digit numbers can be formed only using the digits 5 6 3 and 2 A11 B12 C10 D2

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  1. goldenwolf13
    • one year ago
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    please help i really need it

  2. Vocaloid
    • one year ago
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    we have 4 choices for the first digit 3 choices for the second digit, since we can't repeat digits

  3. Vocaloid
    • one year ago
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    if we have A ways to choose the first digit and B ways to choose the second digit, the total number of choices is A*B

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