x + y = 20 మరియు ,\(\rm \sqrt {\frac{x}{y}} \, + \,9\, = 11 \, - \sqrt {\frac{y}{x}} \) ఐనా   3x2 + 2xy + 7y2 యొక్క విలువ ఎంత?

1
450
2
300
3
1200
4
750

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