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प्रश्न
State if the following is a prime number?
217
उत्तर
A number between 100 and 200 is a prime number if it is not divisible by any prime number less than 15.
Similarly, a number between 200 and 300 is a prime number if it is not divisible by any prime number less than 20.
217 is a not prime number because it is divisible by 7.
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