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OpenStudy (anonymous):
Which is a prime number? A. 21 B. 31 C. 57 D. 91
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OpenStudy (anonymous):
which number can only be divided by 1 and itself?
OpenStudy (anonymous):
D,B,C
OpenStudy (eyust707):
7 * 3 = 21... not prime 19 * 3 = 57.. not prime 9 * 9 = 81.. not prime
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