Which of the following statements is not true?
A. Every real number is also a complex number
B. In order for a+bi to be a complex number, b must be nonzero
C. The variable z is often used to denote a complex number
D. A complex number is a number that can be written in the form a+bi where a and b are real numbers

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option D

@dan815

Wrong, it's option c

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