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MathNet 2008-part-01 — 165 problems (EN–VI) Question 98

Math Olympiad Vault · MathNet 2008-part-01 — 165 problems (EN–VI)

Question 98

(1) Can one divide the set $\{1, 2, \ldots, 96\}$ into $32$ subsets, each containing three elements, and the sums of the three elements in each subset are all equal?

(2) Can one divide the set $\{1, 2, \ldots, 99\}$ into $33$ subsets, each containing three elements, and the sums of the three elements in each subset are all equal? (Posed by Liu Shixiong)