23-08-2017
Mathematics

contestada

Which of the following groups of numbers are all prime numbers? A. 3, 11, 23, 31 B. 2, 3, 5, 9 C. 2, 5, 15, 19 D. 7, 17, 29, 49

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lauren1213 lauren1213

23-08-2017

A because 9 is not prime in answer B, 15 is not prime in answer C, and 49 is not prime in answer D. So the correct answer is A.

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happybunny234 happybunny234

23-08-2017

I think it is A. or D

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