The number of non-negative integer solutions to the equation x₁ + x₂ + x3 + x4 + X5 + X6 + x7 = 12 is equal to O The number of non-negative integer solutions to the equation x₁ + x2 + x3 + x4 + X5 + X6 + 7 = 10 in which ₁ > 2. O The number of non-negative integer solutions to the equation X₁ + X2 + X3 + X4 + X5 + X6 + 7 = 10 in which ₁ < 2. O The number of non-negative integer solutions to the equation X₁ + X2 + x3 + x4 + X5 + X6 + X7 = 14 in which 2₁ > 2. O The number of non-negative integer solutions to the equation x₁ + x₂ + x3 + x4 + X5 + X6 + x7 = 14 in which ₁ < 2. None of these.

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