Learn How to Solve Combinatorics Equations with Expert Help

High School
Calculus and Analysis
Precalculus
Probability and combinatorics

Recent questions in Probability and combinatorics

Alex Cervantes 2022-01-23

How do you evaluate $C_{4}^{6}$ ?

Gabriela Duarte 2022-01-23

How many 4 person committees are possible from a group of 9 people if ?
A) there are no restrictions?
B) Both John and Barbara must be on the committee?
C) Either John or Barbara (but not both) must be on the committee?

Jessie Jenkins 2022-01-22

Two balls are chosen randomly from an urn containing 8 white, 4 black, and 2 orange balls. Suppose that we win 2 for each black ball selected and we lose 2 for each black ball selected and we lose 1 for each white ball selected. Let X denote our winnings. What are the possible values of X, and what are the probabilities associated with each value?

socorraob 2021-12-24

If you can travel from Birzeit to Ramallah in 3 different ways
and from Ramallah to Jerusalem in 2 different ways, then
In how many different ways, can you travel from Birzeit to Jerusalem?
Select one:
a. 3
b. 2
c. 6
d. 5

abreviatsjw 2021-12-23

A bag contains 3 red balls and 3 blue balls. 2 balls are selected at random. How do you find the probability of selecting 2 red balls?

agreseza 2021-12-23

How to calculate percentile? Is it possible to get 100 percentile?
How do we calculate percentile? I think it should be calculated as:
$P =$ Total number of candidates
$L =$ Number of candidates whose marks are below yours
$Percentile = (\frac{L}{P}) \cdot 100$
That means if you are the highest in the range, and there are 200,000 candidates and if your marks are same as 7 others then;
$your percentile = (\frac{199992}{200000}) \cdot 100 = 99.996$
That means in any circumstances you can't have perfect 100 percentile.

kramtus51 2021-12-08

Given cyclic permutations:
$σ = (123)$ , $σ_{2} = (45)$ ,
then what are the inverse cycles $σ^{- 1}$ , $σ_{2}^{- 1}$

chezmarylou1i 2021-12-08

Two stores sell watermelons. At the first store, the melons weigh an average of 22 pounds, with a standard deviation of 2.5 pounds. At the second store, the melons are smaller, with a mean of 18 pounds and a standard deviation of 2 pounds. You select a melon at random at each store. a) What's the mean difference in weights of the melons? b) What's the standard deviation of the difference in weights? c) If a Normal model can be used to describe the difference in weights, what 's the probability that the melon you got at the first store is heavier?

osi4a2nxk 2021-11-16

Suppose that f(x) = x/8 for 3 < x < 5. Determine the following probabilities: a. P(X < 4) b. P(X > 3.5) c. P(4 < X < 5) d. P(X < 4.5) e. P(X < 3.5 or X > 4.5)

Sheelmgal1p 2021-11-16

Take a look at a group of 20 people. If everyone shakes hands with everyone else, how many handshakes take place?

ahgan3j 2021-11-15

Suppose that A and B are independent events such that the probability that neither occurs is a and the probability of B is b. Show that
$P (A) = \frac{1 - b - a}{1 - b}$

skeexerxo175o 2021-11-14

How many subsets with an odd number of elements does a set with 10 elements have?

puntgewelb5 2021-11-14

You arrive at a bus stop at 10 o’clock, knowing that the bus will arrive at some time uniformly distributed between 10 and 10:30. (a) What is the probability that you will have to wait longer than 10 minutes? (b) If, at 10:15, the bus has not yet arrived, what is the probability that you will have to wait at least an additional 10 minutes?

skeexerxo175o 2021-11-13

A box contains 8 red marbles and 3 green ones. Six draws are made at random without replacement. True or false: the chance that the 3 green marbles are drawn equals
$\frac{6!}{3! 3!} {(\frac{8}{11})}^{3} {(\frac{3}{11})}^{3}$

Serotoninl7 2021-11-13

A student is getting ready to take an important oral examination and is concerned about the possibility of having an “on” day or an “off” day. He figures that if he has an on day, then each of his examiners will pass him, independently of each other, with probability .8, whereas if he has an off day, this probability will be reduced to .4. Suppose that the student will pass the examination if a majority of the examiners pass him. If the student feels that he is twice as likely to have an off day as he is to have an on day, should he request an examination with 3 examiners or with 5 examiners?

Clifton Sanchez 2021-11-12

In how many ways can a set of five letters be selected from the English alphabet?

boitshupoO 2021-11-09

Consider a roulette wheel consisting of 38 numbers 1 through 36, 0, and double 0. If Smith always bets that the outcome will be one of the numbers 1 through 12, what is the probability that (a) Smith will lose his first 5 bets; (b) his first win will occur on his fourth bet?

elchatosarapage 2021-11-09

A coin will be tossed 100 times. You get to pick 11 numbers. If the number of heads turns out to equal one of your 11 numbers, you win a dollar. Which 11 numbers should you pick, and what is your chance (approximately) of winning? Explain.

Even though it is always placed into the field of Precalculus, probability and combinatorics problems are more related to analytics and statistical information that many students implement as they are working with the accuracy of their research data. It is one of the reasons why finding good probability combinatorics examples is both complex and not. It is good to have a look through probability combinatorics questions as these will provide you with the answers and help understand how equations work and why possible outcomes are vital for understanding how the calculation takes place.

Precalculus