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[" Lot "P(n)" denotes the number of ways...

[" Lot "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: "]

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