How many four digit numbers can we make from the numbers 5, 6, 7, 9 if you can repeat the digits and use the digit 5 at least once?

Question

Carmen

Mathematics

19 May, 21:32

How many four digit numbers can we make from the numbers 5, 6, 7, 9 if you can repeat the digits and use the digit 5 at least once?

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Answers (1)

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Pete · Answer 1

Multiply the number of choices for each position together. Three of the numbers can be repeated with the one (5) only being used once.

(4 possible choices) * (3 possible choices) * (3 possible choices) * (3 possible choices) = 4 * 3 * 3 * 3 = 108