A prime number is a natural number that is larger than 1 and can only be divided exactly by itself and 1. Which of the following sets of numbers contains only prime numbers?
A){ 31, 29, 35 }
B){ 25, 11, 31 }
C){ 19, 29, 31 }
D){ 11, 19, 12 }
E){ 19, 15, 29 }

Question

Quizplus · Accepted Answer

The set {19, 29, 31} only contains prime numbers. 31, 29, and 19 are all natural numbers larger than 1 that can only be divided exactly by themselves and 1. The other sets contain at least one composite number (a number that can be divided by factors other than 1 and itself) or a number that is not an integer.

A Prime Number Is a Natural Number That Is Larger