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A collection of books has 5 books on mathematics, 7 books on physics and 6 books on chemistry. In how many ways can you combine the collection on a shelf if you want the same subject to stand together? The combinations within each subject should be, 5!, 7! and 6!, right? But how do i calculate the combinations so that they stand together?

Mathematics
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there are \(3!=6\) ways to arrange the three subjects
so multiply all that together and then multiply by 6
Multiply which together? 5!6!7! ?

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Other answers:

yup
Who did you choose what to divide with?
Permutations like? \[\frac{ 5!6!7! }{ (5!6!7!-?) }\]
hold on
you are taking all the books right? don't get married to these formulas the number of ways to arrange items is 5! by the counting principle. similarly for 6 items and 7 items this is not asking you how many ways you can arrange 4 out of 10 for example
\(5!\) ways for math books, by the counting principle \(6!\) ways for the chemistry books by the counting principle and \(7!\) ways for the physics books, again by the counting principle there if you had them arranged as {math, physics, chemistry} then again by the counting principle there would be \(5!6!7!\) ways to arrange the books, but there are \(3!=6\) arrangments of the subjects, so you again need to multiply by 6 i.e. \(3!5!6!7!\)
Oh I get it! Thank you so much! :D
yw

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