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Examen
GRE/GMAT Quant Questions with Correct Solutions
Divisibility of LCM 
If x is divisible by A and by B,then x is divisible by the LCM of A and B, no matter what. 
 
Calculation of LCM 
 
Factors of 20 
Imp: Prime factors of 20 are: 2, 2, and 5 and Factors are, 1, 2, 4, 5, 10, and 20 
 
2 unique prime factors 
3 prime factors 
6 factors 
Some squares 
 
Powers of 2 
1, 2, 4, 8, 16, 32, 64, 128 (first 8) 
 
Powers of Negative 2 
 
Minus numbers squared by Minus 
 
A special number 
 
Pulling out common factor 
 
No Negative square root in...