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27 Cards in this Set
- Front
- Back
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(Number of ways to select without order) equals...
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(number of ways to select with order)/(number of ways to order)
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(Number of ways to select with order) equals...
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(number of ways to order) x (number of ways to select without order)
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permutations of n objects taken k at a time...
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n!/(n-k)!
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combinations of n objects taken k at a time
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n!/(k![n-k]!)
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P(e or f)=
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P(e)+P(f)-P(e and f)
or P(e) + P(f) if mutually exclusive |
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P( e and f)=
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P(e)*P(f) -- if e and f are independent
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(√a)^2=
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a
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√(a^2)=
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a
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(√a)(√b)=
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√(ab)
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(√a)/(√b)=
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√(a/b)
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(a+b)^2=
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a^2+2ab+b^2
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(a-b)^3=
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(a^3)-(3ba^2)+(3ab^2)-(b^3)
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a^2-b^2=
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(a+b)(a-b)
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(X^a)(Y^a)=
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(XY)^a
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(x/y)^a=
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(x^a)/(y^a)
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(x^a)^b=
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x^(ab)
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√(x^2+y^2) not equal to
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x+y
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Elimination meathod
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...
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Quadratic formula
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(-b+-√(b^2-4ac))/2a
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Simple interest=
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V=P(1+(rt/100))
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Compound interest (compounded annually)
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V=P(1+(r/100))^t
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Compound interest (annual interest rate, r, compounded n times per year)
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V=P(1+(r/100n))^nt
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Circle equation
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(x-a)^2+ (y-b)^2 = r^2 "center is (a,b)"
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sum of measures of interior angles of n-sided polygon
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(n-2)(180)
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isosceles triangle
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at least two congruent sides
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Area of parallelogram
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area=(base)(height)
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Area of trapezoid
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area=1/2(Base1+Base2)(heigh)
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