Learn How to Solve Combinatorics Equations with Expert Help

High School
Calculus and Analysis
Precalculus
Probability and combinatorics

Recent questions in Probability and combinatorics

usagirl007A 2021-05-04

$\frac{{((2 x^{3}) y^{2})}^{- 3}}{{((3 x^{2}) y^{4})}^{- 2}}$

remolatg 2021-05-03

The line with y-intercept 4 and perpendicular to x+5y=8

fortdefruitI 2021-05-01

Insert one of the symbols << of >> to make the following statements true.
a) If $x ⟩$ , then x + 8 _ 3.
b) If $x ⟩ - 3$ , then -5x + 18 _ 3.

floymdiT 2021-02-25

Can two events with nonzero probabilities be both independent and mutually exclusive? Explain your reasoning.

OlmekinjP 2021-02-21

If Jeremy has 4 times as many dimes as nickels and they have a combined value of 360 cents, how many of each coin does he have?

Kyran Hudson 2021-02-12

Let the sequence of events E1, E2, . . . , En be independent, and assume that $P (E i) = \frac{1}{i + 1}$ . Show that $P (E 1 \cup \cdot \cdot \cdot \cup E n) = \frac{n}{n + 1}$

Khadija Wells 2021-02-05

A radio station gives a pair of concert tickets to the 6th called who knows the birthday of the performer. For each person who calls, the probability is.75 of knowing the performer birthday. All calls are independent.
a. What is the PMF (Probability Mass Function) of L, the number of calls necessary to find the winner?
b. What is the probability of finding the winner on the 10th call?
c. What is the probability that the station will need 9 or more calls to find a winner?

Khaleesi Herbert 2021-01-31

In one study, the correlation between the educational level of husbands and wives in a certain town was about 0.50, both averaged 12 years of schooling completed, with an SD of 3 years.
a) Predict the educational level of a woman whose husband has completed 18 years of schooling b) Predict the educational level of a man whose wife has completed 15 years of schooling. c) Apparently, well-educated men marry women who are less well educated than themselves. But the women marry men with even less education. How is this possible?

foass77W 2021-01-19

Suppose the alphabet consists of just {a,b,c,d,e}. Consider strings of letters that show repetitions. How many 4-letter strings are there that do not contain “aa"?

opatovaL 2021-01-19

Suppose that a batch of 100 items contains 6 that are defective and 94 that are non-defective. If X is the number of defective items in a randomly drawn sample of 10 items, find (a)P{X = 0} and (b) P {X > 2}.

Khaleesi Herbert 2021-01-10

The problem reads: Suppose $P (X_{1}) = .75$ and $P (Y_{2} ∣ X_{1}) = .40$ . What is the joint probability of $X_{1}$ and $Y_{2}$ ?
This is how I answered it. P( $X_{1}$ and $Y_{2}$ ) $= P (X_{1}) \times P (Y_{1} ∣ X_{1}) = .75 \times .40 = 0.3 .$
What I don't understand is how do you get the $P (Y_{1} ∣ X_{1})$ ? I am totally new to Statistices and I need to understand each part of the process in order to get the whole concept. Can anyone help me to understand why the P and X exist and what they represent?

coexpennan 2021-01-08

Given the following: $P (A) = 0.3 P (B) = 0.2 P (A o r B) = 0.5 P (A a n d B) = 0$
Which of the following is true?
A and B are disjoint.
A and B are neither disjoint nor independent.
A and B are independent.
A and B are disjoint and independent.

Jaya Legge 2021-01-04

Let D be the set of all students at your school, and let M(s) be a ”s is a math major”, let C(s)”s is a computer science student”, and let E(s) be ”s is an engineering student.” Express each of the following statements using quantifiers, variables, and predicates M(s), C(s) and E(s)

Cem Hayes 2021-01-04

Suppose a class consists of 5 students majoring in Computer Science, 5 students majoring in Chemistry and 3 students majoring in Mathematics. How many ways are possible to form a group of 3 students if each group should consist at most 2 students majoring in Computer Science?

Brittney Lord 2021-01-02

Prove that $\sum_{j = 1}^{n} 2^{j} = 2^{n + 1} - 2$
$\forall \geq 1$

naivlingr 2020-12-30

To combine like terms, _ their coefficients and _ the same variables and exponents.

sanuluy 2020-12-25

The sample area should be
$S = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 .$
Assume that the results are equally likely. Calculate the likelihood that the event E="an even number less than 9" will occur.

foass77W 2020-12-24

Suppose a class consists of 4 students majoring in Mathematics, 3 students majoring in Chemistry and 4 students majoring in Computer Science. How many compositions are possible to form a group of 3 students if each group should consist at most 2 students majoring in Computer Science?

Bergen 2020-12-22

A bag contains 2 red checkers and 6 black checkers. A checker is selected, kept out of the bag, and then another checker is selected. What is P(black, then red)?

necessaryh 2020-12-17

Dree rolls a strike in 6 out of the 10 frames of bowling. What is the experimental probability that Dree will roll a strike in the first frame of the next game? Explain why a number cube would not be a good way to simulate this situation.

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

Combinatorics: Examples, Equations, and Practice Problems