Kyriejr30
Kyriejr30 Kyriejr30
  • 16-01-2018
  • Mathematics
contestada

which of these is a prime number 1,11,21,51 ?

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shaniam05
shaniam05 shaniam05
  • 16-01-2018
11,,21,51 are all  prime numbers
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mathstudent55
mathstudent55 mathstudent55
  • 16-01-2018
A prime number has exactly 2 different factors, 1 and itself.

11 is divisible only by 1 and 11.
11 is prime.

21 and 51 have a least three factors. They are not prime.
1 has only 1 factor. 1 is not prime.
Answer Link

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