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3. Which of the following groups of numbers are all prime numbers?
OA. 2, 5, 15, 19
OB. 3, 11, 23, 31
OC. 2, 3, 5, 9
OD. 7, 17, 29, 49

User Egorulz
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Ob. 3,11,23,31
They are prime numbers
User Collin Flynn
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