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frx
Group Title
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?
 one year ago
 one year ago
frx Group Title
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?
 one year ago
 one year ago

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satellite73 Group TitleBest ResponseYou've already chosen the best response.1
there are \(3!=6\) ways to arrange the three subjects
 one year ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
so multiply all that together and then multiply by 6
 one year ago

frx Group TitleBest ResponseYou've already chosen the best response.0
Multiply which together? 5!6!7! ?
 one year ago

frx Group TitleBest ResponseYou've already chosen the best response.0
Who did you choose what to divide with?
 one year ago

frx Group TitleBest ResponseYou've already chosen the best response.0
Permutations like? \[\frac{ 5!6!7! }{ (5!6!7!?) }\]
 one year ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
hold on
 one year ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
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
 one year ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
\(5!\) 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. \(3!5!6!7!\)
 one year ago

frx Group TitleBest ResponseYou've already chosen the best response.0
Oh I get it! Thank you so much! :D
 one year ago
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