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मान लीजिए P = 12xy - 10y²-18x², Q = 14x²+12y²+9xy, और R=5y²-x²+xy हैं। तब (P+Q)-R=

1
20xy-7x²-3y²
2
20xy-3x²-3y²
3
22xy-3x²+3y²
4
22xy+3x²-3y²

Answer:- 2

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