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Use least common multiple or greatest common divisor to solve the problem. Planets A, B, and C orbit a certain star once every 2, 7,
Use least common multiple or greatest common divisor to solve the problem. Planets A, B, and C orbit a certain star once every 2, 7, and 12 months, respectively. If the three planets are now in the same straight line, what is the smallest number of months that must pass before they line up again? 84 months 168 months 24 months 21 months
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