gmat.txt

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Author:
Anonymous
ID:
142465
Filename:
gmat.txt
Updated:
2012-03-19 09:36:20
Tags:
gmat
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Description:
GMAT review
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  1. Number of different arrangements of n objects in a row
    n!
  2. Number of different arrangements when objects are repeated
    TotalObjects! / (Number!Of!Each!Repeated!)
  3. Picking groups, where order doesn't matter

    (If 3 of 7 standby passengers are selected for a flight, how many diff. combos of standby passengers can be selected?)
    Factorial of the total / (Factorial of group 1 * Factorial of group 2)

    7! / (3!x4!)
  4. Permutation where order matters, repetition is allowed

    (# of permutations of a 3 digit lock?)
    n^r

    (3^3, or 3x3x3)
  5. Order matters, no repetition allowed

    (How many different orders of 3 balls selected from 16?)
    n! / (n-r)! - choose r things out of n

    16! / (16-3)!, or 16! / 13!
  6. Combination where order DOESN'T matter, repetition is not allowed (like a lottery)
    n! / (r![n-r]!)

    n is number of things to choose from, you choose r
  7. Combination where order DOESN'T matter, you can repeat (picking scoops of ice cream)
    (n+r-1)! / (r![n-1]!)

    n is number of things to choose from, you choose r of them
  8. Probabilty that X AND Y both occur
    Multiply probabilities together
  9. Probability that independent event X OR event Y will occur
    Add probabilities together
  10. Probability of event X OR event Y, which can occur together
    P(X) + P(Y) - P(X+Y)

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