Question

Which of these sets consists entirely of prime numbers?Select one of the options below as your answer:A. 3, 7, 5, 2, 8B. 5, 11, 13, 41, 61C. 19, 17, 20, 11, 13D. 23, 31, 37, 27, 41

Answer 1

Something useful for you would be http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes
Its a somewhat effective method of deciding on prime numbers.

Answer 2

the method is helpful, of course..
if u need the answer, that is,
option B

Answer 3

thanks .