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OpenStudy (anonymous):
Which number is prime? A. 63 B. 57 C. 51 D. 53
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jimthompson5910 (jim_thompson5910):
Does 63 have factors other than 1 and itself?
OpenStudy (anonymous):
53
OpenStudy (solomonzelman):
The sums of digits of 63 57 and 51, are 9, 12, and 6 respectively. And each of these sums is divisible by 3.
OpenStudy (anonymous):
Thanks y'all
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