Which of the following numbers are prime: (a) 23 (b) 51 (c) 37 (d) 26

Option (a) 23 

(a)23 has only two factors, 1 and 23 therefore, it is a prime number.
(b) 51 has 1, 3, 17 , 51 , not a prime number
(c) 37 has 1 and 37 , it is a prime number
(d) 26 has 1, 2, 13 , 26, not a prime number.

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