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10 October, 07:32

Which one is a prime number?,11,21,51,

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  1. 10 October, 08:27
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    11). A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.
  2. 10 October, 10:57
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    11 is only divisible by 1 and 11, it is a prime number. 21 is visible by 1, 3, 7, and 21; not a prime number. 51 is divisble by 1, 3, 7, 17, and 51; not a prime number. 11 is the only prime number.
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