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Q: Which is not a prime number a. 7 b. 13 c. 27 d. 29?

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The numbers 13 and 29 are prime - the one composite number in that list is 27.

27 is not a prime number.

27

27

27

27 because 3x3x3=27

27 because 9x3=27

27 is not prime. 27 = 3 X 3 X 3

27 = 3 * 3 * 3

A prime number is a number that is divisible only by 1 and itself; it has no other factors. The factors of 7 are 1 and 7. The factors of 13 are 1 and 13. The factors of 27 are 1, 3, 9, and 27. The factors of 29 are 1 and 29. Therefore, 27 is the only one that is not a prime number.

27 is not prime; it is composite because it has other factors. 27 = 3 x 3 x 3.

It is 29 which is a prime number

29 is the next prime number after 27. But 27 is not a prime! 3 x 9 = 27!

29 is prime.

If you mean: 12 13 15 17 27 and 29 then the prime numbers are 13 17 and 29

27 isn't prime; it is divisible by 3 and 9, as well.

The answer is 29.

27

29

29 is a prime. 9, 21, and 27 are composites because they are multiples of 3.

29

29

29

41, 29 and 23 are all prime numbers. 27, however, isn't as it is divisible by three.

39 is not a prime number. It can be divided by 3 and 13.