No of ways if r people out of N people will not be consecutive in circle.

The Will Of People

Let P_n denotes 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____.

Let P_n denotes 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____.

Let P_(n) denotes 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

Let P_n denotes 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____.

Let P_n denotes 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____.

Number of ways of selecting r consecutive things out of n things

Let P_n denotes the number of ways of selecting 3 people out of n sitting in a row, if no two of them are consecutive and Q_n is the corresponding figure when they are in a circle. If P_n- Q_n= 6, then 'n' is equal to 7 (B) 8 (C) 9 (D) 10

The number of ways in which 7 people can sit around a table if two persons take consecutive seats is

There are n stations in a railway line.The number of way of choosing r stations such that no two of them are consecutive is