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SAT Prep

Category - Math

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How many 3-digit numbers can be formed from digits {1,2,3,4,5}?

Explanation

Answer: E - Digits {1,2,3,4,5} form 125 numbers. We choose 3 digits from the set of 5 digits, where digits may repeat and order matters. So, these are the permutations with repetition, where r = 3 and n = 5.
n^r = 5³ = 125

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