3 )write prime numbers between 20 and 30
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23 and 29 are the prime numbers between 20 to 30
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23 and 29 are the prime numbers between 20 and 30.
No even number is a prime number (except 2). Hence, 20, 22, 24, 26, 28 and 30 are not prime numbers.
Out of the rest (21, 23, 25, 27 and 29): 21 and 27 are divisible by 3, so they are not prime numbers. Neither is 25, as it is divisible by 5.
Only 23 and 29 are left, and both are prime numbers.
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