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Question no. 10 with solid reasons !

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Answer:

REAL nmbr

Step-by-step EXPLANATION:

In other words the square root of -1 is not a real number. It is however useful to have a "number" which is the square root of -1 so mathematicians have defined a "number" USUALLY designated i, or sometimes j, that has the property that i*i = -1 (* is multiplication).

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