A) {x: x is a natural number and \[{{x}^{2}}-1=0\]}
B) {x: x is a natural number and \[{{x}^{2}}+1=0\]}
C) {x: x is a an integer number and \[{{x}^{2}}-9=0\]}
D) {x: x is a an integer number and \[{{x}^{2}}=x+2\]}
E) None of these
Correct Answer: B
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