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2014/15 AHSMC Part 1 Problem 2

Problem 2 of 16

The number of two-digit positive integers such that the sum of the two digits is 1212 is

Answer choices

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Solution

There are 77 such numbers, namely 3939, 4848, 5757, 6666, 7575, 8484 and 9393. The answer is (C).

University of Alberta