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Brandyn Cronin

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3y ago
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9y ago

Assuming a 3-digit number does not start with a zero (ie a 3-digit number is one of 100-999):

There are 9 possibilities for the first digit (1-9);

for each of these there are 9 possible remaining numbers for the second digit;

for each of these there are 8 possible remaining numbers for the last digit;

giving 9 x 9 x 8 = 648 possible numbers.

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9y ago

There are 648 3-digit numbers.

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Q: How many 3-digit numbers can be formed using 0123456789 when repetition is not allowed?
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