Posted by **Nicki** on Thursday, October 28, 2010 at 7:33pm.

Which of the following is NOT a real number? (Please explain why!)

(1) -1 (I already ruled out this answers because integers can be real numbers)

(2) square root of 3

(3)square root of -3

(4)0.101001000100001...

- Math -
**MathMate**, Thursday, October 28, 2010 at 10:18pm
Real numbers include rational, irrational, integers, and natural numbers. Real numbers form a subset of complex numbers. So when a number is not real, it is usually complex.

Can you spot a complex number from the list?

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