題組內容
3. Four hundred coins numbered 1 to 400 are put in a row across the top of a cafeteria table. Four hundred students are assigned numbers (from 1 to 400) and are asked to turn over certain e student assigned number 1 is supposed to turn over all the coins. The student assi ber 2 is supposed to turn over every other coin, starting with the second coin.In gene student assigned the number n, for each 1 ≤n ≤ 400, is supposed to turn over every nth coin, starting with the nth coin.
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