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OpenStudy (anonymous):
Which number is composite? A. 19 B. 23 C. 15 D. 17
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OpenStudy (epoweritheta):
15=3*5 so composite , good night from india
jimthompson5910 (jim_thompson5910):
A number is prime if it only has factors of 1 and itself A number is composite if it is not prime (ie it has other factors than 1 and itself)
OpenStudy (anonymous):
I thought it was 15
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