Sets Practice Test 1

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Question : 33 of 33

Marks: +1, -0

Which one of the following is a null set?

A = {x is a real number : x > 1 and x < 1}
B = {x : x + 3 = 3}
C = {ϕ}
D = {x is a real number : x ≥ 1 and x ≤ 1}

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