1. The problem statement, all variables and given/known data Let Pn denotes the no. of ways of selecting 3 people out of 'n' sitting in a row if no two of them are consecutive and Qn is the corresponding figure when they are in circle . If Pn - Qn = 6 , then 'n' is equal to: 3. The attempt at a solution Pn = (n-2) C 3 Qn = (n-3) C 3 But I am getting wrong answer. Please tell which one is wrong Pn or Qn .