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Dimas [21]
3 years ago
15

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

Mathematics
2 answers:
kow [346]3 years ago
8 0
11,,21,51 are all  prime numbers
avanturin [10]3 years ago
5 0
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.
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