Art of Problem Solving

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13:55, 28 October 2018 (diff | hist) . . (+5)‎ . . 1990 AIME Problems/Problem 13 ‎ (→‎Problem)
13:52, 28 October 2018 (diff | hist) . . (+3)‎ . . 1990 AIME Problems/Problem 13 ‎ (→‎Problem)
13:45, 28 October 2018 (diff | hist) . . (-109)‎ . . 1990 AIME Problems/Problem 13 ‎ (→‎Solution)

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