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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196=2x2x7x7
300=2x2x3x5x5
最小公倍数＝2x2x3x3x5x5x7x7
2x2x5x5构成100，剩下的构不成6
A. 600 : 2 x 3 x 2 x 5 x 2 x 5 [ uses three 2's --> Not a Factor ]