146 Answered Questions for the topic Combinations

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?

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?

04/20/19

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... more

04/18/19

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... more

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... more

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... more

03/19/19

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... more

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... more

09/30/18

How many different four letter code words can be formed using the letters A, B, C, and D?

The options are:    1. 16 2. 24 3. 64 4. 120 5. 204 6. 256 7. 308

09/29/18

Combination question!

a survey is to be conducted and three people are to be chosen from a group of twenty. if the group contains 8 men and 12 women, how many groups containing exactly one man are possible

09/18/18

Rearranging Words Without Replacement

Irving wants to rearrange the letters in turkey without replacement. How many ways can he rearrange them with 't' being first and 'u' being second? Please show work. Thanks :)

08/28/18

You rent 4 movies. All are different categories. How many orders can you watch them in?

There are friends over and you rent 4 movies. One comedy, one animated, one action and one science fiction. How many orders can you watch the movies in? 

08/02/18

Please Help me to answer this question. Justify your answer please

A student council has five seniors, four juniors, three sophomores, and two freshmen as members. In how many ways can a four member council committee be formed that includes one member of each class?

07/09/18

How many combinations of 3 variables are possible when single variables can't be repeated

This is a bit of a strange and specific question, but I've been putting a lot of thought into this problem and can only find 8 totally unique combinations, while I thought there'd be 9. I hope I... more

06/07/18

Your iPad has a 4 digit passcode. How many different passcodes are possible, if the digits can repeat?

 I got 210 but my teacher said that was incorrect. What am I doing wrong?

06/07/18

Three girls and four boys are in a preschool class. Determine the number of ways the children can be arranged if a girl is always the line leader?

This question is in my permutation and combination hw but I'm not sure how to do it.

06/02/18

Number arranging

The number of ways of arranging the 26 letters of the English alphabet = 26!. If a computer prints these arrangements at the rate of 1000 per second, how long will this take?

05/31/18

I have the numbers 0 - 49. The lock has three numbers in the combination with a right left right pattern What is the total number of possible combinations?

It's a math story problem.   It deals with a lock.  It uses three numbers from 0-49.  has three numbers in the combination with a right - left- right combination.  What was the total number of... more
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