This news clip is from the column Ask Marilyn, Parade magazine, April 15, 1990. Answer the question
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This news clip is from the column “Ask Marilyn,” Parade magazine, April 15, 1990. Answer the question asked in the article.
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There are 1,000 tenants and 1,000 apartments. The first tenant opens every door. The second closes every other door. The third tenant goes to every third door, opening it if it is closed and closing it if it is open. The fourth tenant goes to every fourth door, closing it if it is open and opening it if it is closed. This continues with each tenant until the 1,000th tenant closes the 1,000th door. Which doors are open?
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You can use a sieve or prime factorizations A door will be opened or closed by a tenant ...View the full answer
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