We call them imaginary numbers, like the square root of negative one.
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9 belongs in the sets: -Natural number set, positive whole numbers -Integer number set, whole numbers -Rational number set, numbers that are not never ending -Real number set, basic numbers without i and that can be expressed in say amounts of apples -Complex number set, the set that contains both real and unreal numbers
example are 1,2,3,4,5,6,7,8,9,10
An irrational number
There are an infinite number. 34, for example.
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