8) How many integer solutions are there for the equation x₁ + x₂ + x3 + x4 = 20 if x₁ ≥1, x₂ ≥2, x3 ≥ 3, x4 ≥0?
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8) How many integer solutions are there for the equation x₁ + x₂ + x3 + x4 = 20 if x₁ ≥1, x₂ ≥2, x3 ≥ 3, x4 ≥0?
solutions are there for the equation x₁ + x₂ + x3 + x4 = 20 if x₁ ≥1, x₂ ≥2, x3 ≥ 3, x4 ≥0?
8) How many integer