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3 3-digit numbers with sum of digits 17 - OMAPA Paraguay 2005.1

Source:

September 14, 2021
number theorysum of digits

Problem Statement

With the digits 1,2,3,......,91, 2, 3,. . . . . . , 9 three-digit numbers are written such that the sum of the three digits is 1717. How many numbers can be written?
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