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Which of the following pairs of constraints contradict each other?
a) 4x + 5y ≤ 75
b) x ≥ 10 2x + 6y ≤ 30
c) y ≥ 3 4x + 5y ≤ 75
d) x ≥ 20 x ≥ 5; y ≥ 10