Permutation and CombinationEasy
Question
Which of the following is the empty set ?
Options
A.{x : x ∈ R and x2 + x + 1 = 0}
B.{x : x ∈ R and x2 − x + 1 = 0}
C.{x : x ∈ R and x2 + 2x + 1 ≤ 0}
D.{x : x ∈ R and x2 − 2x + 1 ≥ 0}
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