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in Combinatorics and Mathematical Induction by (46.9k points)
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Find the sum of all 4-digit numbers that can be formed using digits 1, 2, 3, 4, and 5 repetitions not allowed?

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The given digits are 1, 2, 3, 4, 5 

The no. of 4 digit numbers

Sum of the digits = 1 + 2 + 3 + 4 + 5 = 15 

Sum of number’s in each place = 24 × 15 = 360

Sum of numbers

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