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OpenStudy (anonymous):
Which is a prime number? A. 21 B. 31 C. 57 D. 91
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OpenStudy (baseballer2014):
31
OpenStudy (anonymous):
A prime number is a number that is divisible by 1 and itself so you would have to see what number is only divisible by 1 and itself
OpenStudy (xguardians):
B. Why? Its the only one that is divisible by itself and 1 and has no other factors.
OpenStudy (anonymous):
Tyyy
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