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Which of the following sets are null sets?

$(i)\; A = { x : x \lt 1 \text{and} x \gt 3 } \quad (ii) B = { x : x^2 = 9 \text{ and} \; 3x = 7 }$

$(iii) C = { x : x^2 - 1 = 0, x \in R } \quad (iv) D = { x : x\; \text{is an even prime number} }$

1 Answer

(i) and (ii)
Hence (B) is the correct answer.
answered Jun 12, 2014 by thanvigandhi_1
edited Jul 2, 2014 by balaji.thirumalai
 

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