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Let Pn denotes the number of ways of sel...

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

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