railway RRB Technician Grade 1 Mock Test 2024 Mathematics Sets

Which one of the following is a null set?

1
A = {x is a real number: x > 1 and X < 1}
2
B = {x ∶ x + 3 = 3}
3
C = {Φ}
4
D = {x is a real number : x ≥ 1 and x ≤ 1}
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