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The Straggler Shakes Hands

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Author: Melissa Kennedy, Susan Rose, Ethel Breuche
Description: Algebra, difficulty level 3. There were one hundred forty-one handshakes in all. How many people did the straggler know? This puzzle involves a quadratic expression and triangular numbers.

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Problem page: /library/go.html?destination=640
Solution page: Problem #640

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