Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Mathematics Sets Set Theory and types of Sets
Which of the following is a null set?
1
{x : |x| < 1, x ∈ N}
2
{x : |x| = 5, x ∈ N}
3
{x : x2 + 2x + 1 = 0, x ∈ R}
4
More than one of the above
5
None of the above