4 - Sabendo que o conjunto A = { X E Z / 0 ≦ X < 7} e o conjunto B = { X E Z / - 2 ≦ X ≦ 4}, determine A ∪ B:
a) A ∪ B = { X E R / 0≦ X ≦ 4}
b) A ∪ B = { X E R / -2 ≦ X < 7}

c) A ∪ B = { X E R / 0 < X ≦ 7}

d) A ∪ B = { X E R / 0 < X < 5}​
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