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[" Let "P(n)" denote the "],[" number of...

[" Let "P_(n)" denote the "],[" number of ways in "],[" which three people "],[" can be selected out of "],[" 'n' people sitting in a "],[" row if no two of them "],[" are consecutive.If "],[P_(n+1)-P_(n)=15" then the "],[" value of 'n' "]

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