158 Answered Questions for the topic Combinations

04/01/22

#### Struggling on this problem retaining to sets

Let the Universal Set, S, have 100 elements. A and B are subsets of S. Set A contains 45 elements and Set B contains 61 elements. If Sets A and B have 20 elements in common, how many elements are...
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09/21/21

#### 3 questions: permutations and combinations

Dear math experts,I hope this finds you well.I solved 2 questions and I wonder whether my answers are correct.1) A coach must choose 8 players randomly from 10 players and assign them to three...
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03/14/21

#### List of possible Matchups of NFL teams

Please list all possible matchups of all 32 NFL teams. The list of teams is below. I know there should be 31 x 31 total possibilities, but that inclues repetition such as Patriots vs Bills and...
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Combinations Probability

12/30/20

#### Probability and Combinations

show that 1)5 ( n ) = n ( n - 1 ) 5 42) r ( n ) = n ( n - 1 ) r r - 13) 2 ( 2n -1 ) = ( 2n ) n-1 n*the bracket includes the...
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12/08/20

#### Permutation and Combination Question

A bookshelf displays different types of books, 6 books in English (E) and 5 books in Spanish (S). If 4 books are chosen among the English language books and 3 are selected from the Spanish language...
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11/26/20

#### 1. There are 6 women and 5 men applying for positions at Walmart in Toronto. There are only 4 positions available.

1. There are 6 women and 5 men applying for positions at Walmart in Toronto. There are only 4 positions available. a) In how many ways can these four (4) positions be filled?b) In how many ways...
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11/26/20

#### The director is looking at eight performers for the roles of Luke Skywalker, Han Solo and Darth Vader. How many ways are there that the director cast these three roles?

1. In the school play of Star Wars, the director is looking at eight performers for the roles of Luke Skywalker, Han Solo and Darth Vader. How many ways are there that the director cast these three...
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09/14/20

#### Solve the combination

At a chinese buffet, there are five entree selections. If two entrees may be selected, how many ways may the plates be filled?

09/09/20

#### Possible Combinations

Hi! I have to figure out how many possible combinations there are with 3 objects (square, circle, triangle), 3 per row. Also, 4 objects, 3 per row. Can you help me understand how you find the...
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Combinations

07/01/20

#### How Many Classes..

how many different course schedules can john have if he is taking 7 different classes and each class is offered every period? Assume there are 7 class periods in a day

10/07/19

#### Five cards are selected from a 52-card deck for a poker hand.

A royal flush is a hand that contains the A, K, Q, J, and 10, all in the same suit. What is the probability of being dealt a royal flush?

Combinations Permutations

09/23/19

#### Permutations HELP

Rework problem 30 from the Chapter 2 review exercises in your text, involving basketballs with defective valves. For this problem, assume the bag contains 16 basketballs, 6 of which have defective...
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Combinations Elementary Math

05/27/19

#### You have 9 windows that can be put in 3positions each, how many combinations are there for all 9 windows?

05/15/19

#### probability and permutations

The 10 letter tiles S A C D E E M I I and O are in a bag. What is the probability that the letters S A M E will be drawn from the bag in that order?

#### Combination problem with repetition. GRE Anagram Grid questions. Why do we divide?

If 7 people board an airport shuttle with only 3 available seats, how many different seating arrangement are possible? (Assume that 3 of the 7 will actually take the seats.) So I think the answer...
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#### Combination problem with repetition. GRE Anagram Grid questions. Why do we divide?

If 3 of 7 standby passengers are selected for a flight, how many different combinations of standby passengers can be selected? So the answer to do this I think is 7! / (4! * 3!) The standby...
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04/17/19

#### Statistics - Combos/Permutations

License plates in your state have 3 letters followed by 3 numbers. But in order to avoid confusion with the numbers,letters "I" and "o" are not used. How many different possible license plates can...
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Combinations Probability

03/25/19

#### As part of a quality-control program, 3 light bulbs from each batch of 100 are tested. In how many ways can this test batch be chosen?

03/19/19

#### Combinations [fundemental counting principal]?

> How many 3-digit integers can be chosen such that none of the digits
> appear more than twice and none of the digits equal zero?
I have approached the following problem like this.
1. We...
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03/13/19

#### Intuition behind combination problem?

I came across this question on a GRE practice exam. I'm trying to build intuition behind how to correctly approach these types of problems:
A reading list for a humanities course consists of 10...
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