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URGENT! in how many ways can 7 books be arranged in a shelf if three particular books must stay together?​
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1 vote
1 vote
URGENT!

in how many ways can 7 books be arranged in a shelf if three particular books must stay together?​

User Tomkinsc
by
3.0k points

2 Answers

4 votes
4 votes

We need to place 3 particular books so that they are always together.

let 3 books are one books

we have 5 books

these can be arranged in ⁵P5 = 5! = 12O

total books = 3 × 2 = 6

Required no. of books are 120×6 = 720.

User Pinoniq
by
2.9k points
3 votes
3 votes

Answer:

5040 ways

Explanation:

User Dave Maff
by
3.2k points
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