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[" et "P(n)" denotes the number of ways ...

[" et "P_(n)" denotes the number of ways in which three people can be selected out of n people sitting in a "],[" w,if no two of them are consecutive.If "P_(n-1)-P_(n)=15" then the value of "n" is "],[[" 1) "7," (B) "8," (C) "9," (D) "10]]

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