# GMAT formulas

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GMAT Formulas

Algebra Formulas

Exponential Equations

xnxm = xn + m

(xn)/(xm) = x n - m

(x/y)n = (xn)/(yn)

xnyn = (xy)n

(xy)z = xyz

x-n = 1/(xn)

1n = 1

x0 = 1

0n = 0, except 00 = 1

FV = CV(1 + g)T

Other

Distance = Rate*Time

Wage = Rate*Time

Arithmetic Formulas

Combinatorics

Combinations:nCk = n!/((n-k)k!)!

Permutations:nPk = n!/(n-k)!

Circular: (n-1)!

k = number of objects selected from a pile of n objects

n = total number of objects from which k objects can be selected

Fractions

(a/b)/(c/d) = (a/b) * (d/c)

Percents

Percent Change, as a decimal = (New - Old)/Old

N = (1 + G)O; N = New Value, 0 = Old Value, G = Growth Rate as decimal

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Number Properties

(Odd)(Even) = Even

(Odd)(Odd) = Odd

(Even)(Even) = Even

(Odd) ± (Even) = Odd

(Odd) ± (Odd) = Even

(Even) ± (Even) = Even

(Positive)(Positive) = Positive

(Positive)(Negative) = Negative

(Negative)(Negative) = Positive

(Positive)/(Negative) = Negative

(Positive)/(Positive) = Positive

(Negative)/(Negative) = Positive

Statistics

Average (Arithmetic Mean): (sum of all numbers)/(number of numbers)

Geometry Formulas

Angles

Sum of Interior Angles of Polygon = (n-2)(180)

n = number of sides of a polygon

Central Angle = 2(Inscribed Angle)

Area

Square: A = a2

Rectangle: A = lw

Parallelogram: A = bh

Trapezoid: A = .5(a+c)h, where a and c are the lengths of the parallel sides

Circles

π = pi = 3.1415

Area: A = πr2

Circumference: C = 2πr

Central Angle = 2(Inscribed Angle)

Area of Sector = (x/360)πr2

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