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Earn +20 ptsQ: Are 31 and 51 prime numbers?
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Which numbers out of 39 43 31 49 51 are prime?
39 = 3 x 13 49 = 7 x 7 51 = 3 x 17 43 is prime 31 is prime
Which is not a prime number 17 23 31 or 51?
51 is not a prime number: 3x17=51
Which of 21 31 51 and 91 is a prime number?
31 is a prime number.
What two prime numbers added together equal 51?
No two prime numbers satisfy that request.
Which is a prime number 91 51 31 21?
31
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