Find the number of positive three-digit integers whose digits are among 9, 8, 7, 5, 3, 1 in which none of the digits are the same.
15
120
216

The number of permutations of objects from objects is .

The number of ways of choosing 3 digits from 6 digits without replacement ( order is important) is . This is the number of all possible permutations of choosing 3 from 6.

Correct choice is 120.

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