GRE Formulas
Terms
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- Formula for % increase
-
* - Formula for % decrease
-
Where X=the base -
What does this equal? -
answer -
What does this equal -
answer - x^2-2xy+y^2=
- (x-y)^2
- sales price =
- (original price) - (%discount)(original price)
- total price
- (#of items) cost
- Distance
- Rate x time
- 30:60:90 triangle
- 1:2:square rt of 3
- 45:45:90 triangle leg ratios
- 1:sr of 2
- Pi =
- approx 3
- nCk
- n! / k!(n-k)!
- Av Speed =
- TD / TT
- P(AorB)
- P(A)+P(B)-P(A&B)
- W/ probab how do you handle exclusions?
- Divide factorial of # of events y the product of the exclusions
- 10% of 30%
- .10x.30
- Volume of Rectangle Solid
- LxWxH
- Sum of terms =
- Average x # of terms
- Slope =
-
Rise / run
y2-y1 / x2-x1
neg slope = \
pos slope / - STD =
-
Avg of array (find mean)
diff btwn each & mean
Square differences
Find mean of squared differences - Probability formula
- # favorable outcomes / # possible outcomes
- 6C2
- 15
- 4C2
- 4
- 16C4 =
- 16C12 =
- multiple of 3
- sum of digits is multiple of 3
- multiple of 4
- last two digits is a multiple of 4
- multiple of 6
- sum of digits is a multiple of 3 and last digit even
- multiple of 9
- sum of digits is a multiple of 3 and sum of last two digits are multiple of 4 ie 135
- % formula =
- part = percent x whole
- Percent increase =
- amount of increase / original whole then x 100
- Percent decrease =
- amount of decrease / original whole then x 100
- What is the average formula
-
avg = sum / # of terms
sum = avg x # of terms - Avg of evenly spaced #s
- avg of min + max
- How do you count consecutive numbers?
- Max - Min +1
- Ratio formula
- ratio = of / to