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In how many ways can five examination papers be arranged so that physics and chemistry paper never comes together?

In how many ways can five examination papers be arranged so that physics and chemistry paper never comes together? 
    

Grade:12th pass

1 Answers

Harshit Singh
askIITians Faculty 5963 Points
3 years ago
Dear Student
Total ways for arranging five papers = 5!
= 120

Total ways in which physics and chemistry comes together = 4! (2)
= 48

Total ways in which five examination papers be arranged so that physics and chemistry paper never comes together =
Total possible ways –Total ways in which physics and chemistry comes together

= 120 –48
= 72

Thanks

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