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Secondary 1 | Maths
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Halp :D
14 = 2x7
common = 2x2x2x7 = 56
After 56 days, they will visit the library on the same day again.
(Albert visits on the 8th, 16th, 24th, 32nd, 40th, 48th, 56th,... day after the 0th day, while Chris visits on the 14th, 28th, 42nd, 56th,... day after the 0th day)
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