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## Homework Statement

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:

## 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 .