Asked by lindas
a library shelf contains 7 books. in how many ways can they be arranged if there are no restrictions?
b. the mathamatics text book must be first.
c.the 3 math text boooks must be together
b. the mathamatics text book must be first.
c.the 3 math text boooks must be together
Answers
Answered by
Reiny
a) 7!
b) 1 x 6!
c) treat the 3 math books as one item, pretend they are bundled together, so there are 5 items to arrange.
for 5! ways.
b) 1 x 6!
c) treat the 3 math books as one item, pretend they are bundled together, so there are 5 items to arrange.
for 5! ways.
Answered by
Craig
c)3! x 6!
The three must remain together but can be in any permutation with the rest. It would be 5! ways if the three books had to be in a certain position.
The three must remain together but can be in any permutation with the rest. It would be 5! ways if the three books had to be in a certain position.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.