Let Pn denote the number of ways in which three people can be selected – InterviewSolution

1.	Let Pn 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, Pn+1−Pn=15, then the value of n, is___.
Answer» 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, is___.

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