factor problem

If M is the least common multiple of 90, 196, and 300, which of the following is NOT a factor of M?

A. 600
B. 700
C. 900
D. 2,100
E. 4,900

Is there easier way to slove this problem other than factoring all 90, 196, 300 and finding the least common multiple? Thanks in advance!

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cris: Master | Next Rank: 500 Posts; Posts: 128; Joined: Sat Nov 17, 2007 11:59 am; Thanked: 1 times

by cris » Sat Nov 24, 2007 8:29 pm

i think you did not copy the problem correctly

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gmatguy16: Master | Next Rank: 500 Posts; Posts: 124; Joined: Thu Aug 23, 2007 5:11 am; Thanked: 2 times

by gmatguy16 » Wed Nov 28, 2007 6:39 pm

imo a ,whats oa?
lcm=2*2*3*3*5*5*7*7=100*3*3*7*7...so everything apart from 600 is possible

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