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Probability, Permutations, Combinations (more for SAT 2 prep) Flashcards | StudBud
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Probability, Permutations, Combinations (more for SAT 2 prep)
Probability, Permutations, Combinations (more for SAT 2 prep)
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Probability questions
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Answers
1
P(A|B) means the prob of A given that B has happened. If A and B are INDEPENDENT, then P(A|B) =
P(AC)
P(A ∩ B)
P(A)
P(B|A)
2
For a single six-sided die, what is the probability of rolling a number
greater than 4
?
1/2
0
1
1/3
3
What is the theoretical probability that you draw a
red
card from a shuffled deck of cards?
1/2
1/13
0
1/4
4
How many ways are there to select students from a class of 20 for President, VP, and Treasurer?
1140
6840
8000
60
5
How many ways can you select 3 students from a class of 20 for a committee?
1140
8000
60
3420
6
What is the probability of rolling a sum of 7 when you roll two standard six-sided dice ?
1/12
1/6
7/36
1/11
7
Two dice are rolled. What is the probability that the sum is less than 5?
1/36
1/12
1/6
5/18
8
The area shaded in green is which of the following?
A ∪ B
None of these.
A ∩ B
The complement of A
9
Two coins are tossed. What is the probability of getting two heads, P(HH)?
1/2
0
1/4
1
10
The area shaded in green is which of the following?
The complement of A
A ∪ B
The union of A and B
A ∩ B
11
What is the probability that you draw an
ace
from a well-shuffled deck?
1/4
0
1/13
1/2
12
What is the probability that you draw a
diamond
from a well-shuffled deck of cards?
1/13
1/2
0
1/4
13
What is the probability that you draw the
ace of diamonds
from the deck?
1/52
1/13
1/4
0
14
Disjoint/mutually excusive events have NO COMMON OUTCOMES. Which of these pairs is disjoint?
Raining in Miami, Ms. Kelly using an umbrella
Picking a card: heart, black
Snow in Toronto, rolling a six
Rolling a 5, rolling a prime number
15
P(A U B) =
P(A)+P(B)-P(A ∩ B)
P(A) * P(B)
P(A) + P(B)
P(A and B)
16
Pick 5 students from BC. What is the probability of picking exactly 3 seniors & 2 juniors?
About 2.9%
About 39%
About 29%
About 3.9%
17
What is the probability that a number less than 7 will appear when you roll a die one time?
1/6
1
1/2
0
