Which one of the following is not prime number and how? 1)31 2)61 3)71 4)91
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a prime number should only be divisible by 1 and the number itself.
over here, it is clear that 91 is not a prime number as it is divisible by 1,7,13 and 91.
over here, it is clear that 91 is not a prime number as it is divisible by 1,7,13 and 91.
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91 is not a prime no as it is divisible by 7
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