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in how many ways can ten examination papers be arranged so that the best and worst never come together

manisha mehra , 15 Years ago
Grade 11
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Badiuddin askIITians.ismu Expert

Last Activity: 15 Years ago

Dear manisha mehra

total number of ways in which 10 examination papers be arranged = 10!


now total number of ways in which examination papers are arranged such that best and worst paper always come together =9!*2!


so number of ways in which they never come togerther = 10! -9!*2!

                                                                             =8*9!

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