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Problem 11 (1991 AJHSME)

AJHSMENormal

From module Counting Fundamentals

Problem

There are several sets of three different numbers whose sum is 1515 which can be chosen from {1,2,3,4,5,6,7,8,9}\{1, 2, 3, 4, 5, 6, 7, 8, 9\}. How many of these sets contain a 55?

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