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
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