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Problems with LCM & GCD - need help [#permalink]
05 Sep 2004, 16:12

Hi,

I'll take the GMAT the 15th of this month, I still have this week to study hard. I know most of the subjects (time/distance, average, time work, triangles, mixture, integer...) But I realize there is something which seems quite simple for everybody but that I can't do it right 100% of the time : LCM or GCD (Least common multiple and greatest common divisor)

I've already looked the lesson in gmat and in the books it's not always very clear. Can someone take 2-3 examples and show me how to find it, especially how to choose the number after you do the prime factorization...

I feel quite stupid to ask this because it seems it's very simple but I really got a problem there so I hope someone can help. thanks guys.

1. a = 4m, b = 4n, and gcd(m, n) = 1
2. lcm(a, b) = 24

a*b = gcd*lcm
Basically, you would need both 1&2 to answer the question and C would be it. You can test it out with plugging in numbers if you want. _________________

Thanks you both for your time, your help and your dedication to this forum...I'll let you guys know about my score (good or not)

This website is amazing and I think now the community is bigger and bigger, I also found a lot of other websites where some people put your link there or talk about Gmat Club...you deserve it !!!