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Anonymous
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C+ (-2)= 21= 21+2= 23+ (-2)= 21 23+ (-2)= 21 is the same as 23- 2= 21
It is 21/23.
21 is composite. 19 and 23 are prime.
23/21 Must become a mixed fraction, so it becomes 1 and 2/21st , and that is your answer.