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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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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?

User Lofton
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1 Answer

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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
User RaduM
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