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OpenStudy (goldenwolf13):
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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OpenStudy (goldenwolf13):
please help i really need it
Vocaloid (vocaloid):
we have 4 choices for the first digit 3 choices for the second digit, since we can't repeat digits
Vocaloid (vocaloid):
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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