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The correct constraint representing the requirement "Of those households with children under 16, no more than 30% should be premium subscribers" is
0.30x₂₁ - 0.70x₂₂ ≤ 0
0.70x₁₁ - 0.30x₁₂ ≤ 0
- 0.30x₂₁ + 0.70x₂₂ ≤ 0
0.70x₂₁ - 0.30x₂₂ ≥ 0
none of the above

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