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31 March, 17:48

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

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  1. 31 March, 18:16
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    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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