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Sticky Note
Which is a prime number? 27, 25, 23, 21
  1. 27
  2. 25
  3. 23
  4. 21
Explanation

27 → divisible by 3 and 9 (not prime).

25 → divisible by 5 (not prime).

23 → divisible only by 1 and itself (prime).

21 → divisible by 3 and 7 (not prime).

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  1. 11
  2. 12
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