Question
Which of the following is a prime
number?Solution
399 = 21Â 
19 So it is not a prime number. 621 = 23 27 So it is not a prime number. 363 = 33Â 11 So it is not a prime number. 461 is a prime number because it is not divisible by any number except 1 & itself. 481 = 37Â 13 So it is not a prime number.
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