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23 July, 20:17

Out of 2 9 15 21 is not a composite

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  1. 23 July, 20:36
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    Answer: 2 Your Welcome!
  2. 23 July, 20:41
    0
    2

    Step-by-step explanation:

    2 is actually a prime number because composite numbers have more than 2 factors but prime numbers don't.
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