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Let x k + y k = a k , (a, k > 0) and dx dy + 3 1 x y ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = 0, then k is

1. 3 4
2. 3 2
3. 2 3
4. 3 1

Correct answer: 3 2

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