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Question Number 138960 by Dwaipayan Shikari last updated on 20/Apr/21

$$XandYstandinaline,atrandomwith10otherpeoples.$$$$Whatistheprobabilitythattherewillbeexactly4persons$$$$betweenXandY?$$

Commented by mr W last updated on 20/Apr/21

$$p=\frac{2\times C_4^{10}\times 4!\times 7!}{12!}=\frac{2\times 25401600}{12!}=\frac{7}{66}$$

Commented by mr W last updated on 20/Apr/21

$$yes.icorrected.$$

Commented by Dwaipayan Shikari last updated on 20/Apr/21

$$Hmmsir,butanswergivenas\frac{7}{66}!$$

Commented by I want to learn more last updated on 20/Apr/21

$$\mathrm{Please}\mathrm{sirs}\mathrm{help}\mathrm{me}\mathrm{solve}\mathrm{Q}138976$$

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