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For real numbers x and y, let M be the maximum value of expression `x^4y + x^3y + x^2 y + x y + xy^2 + xy^3 + xy^4` , subject to `x + y = 3`. Find [M] where [.] = G.I.F.

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RESONANCE ENGLISH-EQUATIONS -EXERCISE-2 (PART-I: PREVIOUS ASKED QUESTION FOR PRE RMO)
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