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GRE equations
Essential equations for the GRE
17
Mathematics
Graduate
10/30/2013
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Cards

Term
Work
 Definition
Rate x Time
Term
Work (mutiple workers)
 Definition
Individual rate x Number of workers x time
Term
Sum of interior angles of a polygon
 Definition
(n-2)180
Term
Area of a trapezoid
 Definition
1/2(b1+b2)xh
Term
Area of a parallelogram
 Definition
bxh
Term
Side ratio of 30:60:90 triangle
 Definition
x:2x:x√3
Term
Side ratio of a 45:45:90 triangle
 Definition
x:x:x√2
Term
Total number of choices (non-ordering)
 Definition
Product of the independent choices
Term
Total number of choices (ordering)
 Definition
n!
Term
x2 - y2
 Definition
(x+y)(x-y)
Term
(x+y)2
 Definition
x2 + 2xy + y2
Term
(x - y)2
 Definition
x2 - 2xy + y2
Term
Divisibility
 Definition

 

By 3 - sum is divisible by 3

By 4 - las two digits form a number divisible by 4

By 6 - divisible by 2 and 3

By 8 - last 3 digits form number divisible by 8

By 9 - sum of digits divisible by 9
Term
(xy)n
 Definition
xnyn
Term
(x/y)n
 Definition
xn/yn
Term
x is proportional to y
 Definition
x = ky
Term
x is inversely proportional to y
 Definition
x = k/y
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