If M is the least common multiple of 90, 196, and 300, which of the following is NOT a factor of M?
600
700
900
2,100
4,900
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拆分成质因子:LCM=2*2*3*3*5*5*7*7
拆分成质因子:LCM=2*2*3*3*5*5*7*7
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