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Mathematics 10 Online
OpenStudy (anonymous):

Which of the following numbers is prime? 61, 123, 51, or 213

OpenStudy (anonymous):

61. 61 = 61x1 123 = 123x1, 41x3, 213 = 213x1, 71x3, 51 = 51x1, 17x3. ans = 61.

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