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ObeyChris{~}
 3 years ago
Which number is prime?
A.
51
B.
53
C.
57
D.
63
ObeyChris{~}
 3 years ago
Which number is prime? A. 51 B. 53 C. 57 D. 63

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amistre64
 3 years ago
Best ResponseYou've already chosen the best response.1if the sum of the digits add to a multple of 3, then its divisible by 3 and not prime is one little trick to narrow the odds
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