GRE

简答题For thisquestion，write your answer in the box．
What is the least common multiple of 21 and 35?

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105．
When factored into prime numbers．21=3×7 and 35=5 X 7．Thesmallest number which contains both 3×7 and 5×7 is 3 X 5×7=105．This is the least common multiple of 21 and 35．

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