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新gre数学重要考点：Mode Mode The mode of a set of numbers is the number that repeats the most in the set. Example: Mode of the set {1,2,3,2,4,5} is 2. The set of numbers {1,2,4,1,2,3,6,8}has two modes:1 and 2. Remember: There can be more than one number with the highest repeat count. In that case all of them with the highest repeat count are modes. 新gre数学重要考点：Dividing Polynomial by Monomial Dividing Polynomial by Monomial To divide a polynomial by a monomial, use distributive law to separate the numerator and reduce each term. Example: If we divide by 2x, we get /=4x2/-6x/=2x-3. Remember: Do not forget to divide all the terms. If the denominator is a higher order polynimial, do not distribute the denominator. 新gre数学重要考点：Sum of Arithmetic Progression The sum of n-numbers of an arithmetic progression is given by S=nxdn/2 where x is the first number and d is the constant increment. example: sum of first 10 positive odd numbers:101+2109/2=10+90=100 | 
