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A $125-$pages document is on the floor randomly spread. If $4$ pages are picked up at random, what is the chance that these are the document's last four pages and in the right order? Page $122, 123, 124$ and $125.$

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    See: http://math.stackexchange.com/questions/2128980/chance-of-selecting-the-last-k-pages-in-correct-order-from-a-set-of-n-pages/2128999#2128999 – 2017-02-05
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    What do you mean "about" 4 pages ? And what have you tried ? On this site, you need to first show some effort .. – 2017-02-05

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