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Math-Words, GRE

Terms

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Quant Comp: always
Plug In at least TWO numbers- one 'normal' (2, 3, 5) and eliminate two answers (A and C, for example); then Plug In at least one 'weird' (0, 1, neg, fraction, really big) number to try to disprove my first answer. if I CAN disprove than it
.8 as fraction:
4/5
.6 as fraction:
3/5
1/3 as percent:
33.33333%

Equation: 

Percent Change 

(Difference / Original) * 100
2^2 * 2^ 4 = 
2^6
2^2 + 2^4 =
who knows (ie, NOT 2^6) 
(4^5)^2 =
4^10
root(32)  =
root(2x2x2x2x2) = 4 root(2)
root(1)=
1
root(2)=
1.4
root(3)=
1.7
root(4)=
2

Equation:

Probability 

(# possible outcomes that satisfy the condition) DIVIDED BY (# total possible outcomes)

Given Events A & B:  

PROBABILITY of A AND B:

Probability of A TIMES Probability of B

Given Events A & B:

PROBABILITY of A OR B 

Probability of A PLUS Probability of B
Probability that A happens PLUS Probability that A Won't happen = 
1
0! =
1
7! =
7 x 6 x 5 x 4 x 3 x 2 x 1
PERMUTATIONS- keys to finding answers:

1. How many 'slots' do I have?

2. How many options per slot?

Multiply each 'slot's options with each other. (6 pictures for 3 positions on a wall: 6x5x4) 

COMBINATIONS- keys to finding answers:

1. Like a permutation: multiply each 'slot's options with each other- THEN: 

2.  divide by the factorial of the number of slots.

ie, bring home three of five ice cream flavors. (5x4x3)/3! 

Difference between Permutation and Combination?

Permutation- Order is Relevant (1st, 2nd, 3rd place finalists; pictures on wall)

Combination- Order is NOT Relevant (5 of 8 pizza toppings)

1^2=
1
(1/2)^2 =
1/4
a (neg. #)^2 is always
positive

Deck Info

25

turtle.eck

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