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Genevieve forgot the last two digits of her four-digit locker code: 21?? If the number is divisible hy 5,6, and 7, what is Genevieve's locker code?
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Jan 7, 2018
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Genevieve forgot the last two digits of her four-digit locker code: 21?? If the number is divisible hy 5,6, and 7, what is Genevieve's locker code?
Mathematics
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Tibor Udvari
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If a number is divisible by 5, 6, and 7,
it's divisible by 5 x 6 x 7 = 210, the least
common multiple of the numbers. So her number
is a multiple of 210. The only 4-digit multiple
is 210 that starts 210 _ is 2100, so that's her number.
DobbyTheElf
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Jan 13, 2018
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DobbyTheElf
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