Question

Here is a list of numbers . 1 5 4 2 7 15 17 11 14 13 From the list , write down three different prime numbers that add together to make 20​

Answer 1

7+11+2 = 20 is one possible combination.

When looking for prime number I think people tends to avoid even number, but in case of 2 it is actually prime.

Another possible combination is is 5+2+13. Keep in mind that the number 1 is not a prime number because by definition, a prime number must have two positive factors.

Answer 2

2 + 5 + 13

Explanation:

prime numbers are numbers with only 2 factors

these are 1 and the number itself

from the list

2 , 5, 7, 11, 13, 17 ← are prime numbers and

2 + 5 + 13 = 20