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Gmat formula's

formulas for averages average = (sum of items)/(number of items)
formulas for sums sum of items = (average)*(number of items)
distance/rate/time or work/rate/time formulas d = rt a = rt
# of combination formulas n! / [r!(n–r)!]
Square properties Area = length2 Perimeter = 4*length
Rectangle properties Area = length*width Perimeter = 2(length) + 2(width)
Circle properties Area = πr2 Circumference = 2πr
Parallelogram properties Area = base*height Perimeter = 2(base) + 2(height)
Triangle properties Area = (base*height) / 2 Pythagorean Theorem: a^2+b^2=c^2
Trapezoid properties Area = (1/2)*{(a+b)/h} , where a and b are the length of the parallel sides
Probability (Number of favorable outcomes) / (Number of all possible outcomes)
Interest Simple Interest = P*r*t Annual Compound Interest = P(1+r)t Compound Interest = P(1 + r/x)^(xt); x = number of times the interest compounds over the year
Exponent Rules (x)−n= 1 / x^n x^m*x^n=x^(m+n) x^m / x^n =x^(m−n) (x/y)^n = (x^n) / (y^n) (x^m)^n = x^(m*n)
Created by: Hbouknani