Question
Which of the following are prime numbers? $161$
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Answer
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 $20.$ $161$ is a not prime number, because it is divisible by $7.$
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