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