23
1+2+3+6 is one possible answer.
-13
Factors of 12 are: 1/12, 2/6 and 3/4. Only set which add up to 7 are 3 & 4.
when you add the numbers it will add up to a multiple of 3. Lets say 12 1+2=3 or 36 3+6=9, they are all multiples of 3.
30
The two prime numbers that add up to 19 are 7 and 12. Prime numbers are numbers greater than 1 that can only be divided by 1 and themselves. In this case, 7 and 12 are not prime numbers, and there are no two prime numbers that add up to 19.
There are two sets of two numbers that have cubes that add up to 1729 are {1, 12} : 1³ + 12² = 1 + 1728 = 1729 {9, 10} : 9³ + 10³ = 729 + 1000 = 1729
23
1+2+3+6 is one possible answer.
48
The factor pairs of 12 are (12, 1) (6, 2) (4, 3) None of them add up to 5.
1, 2, 4, 5
1, 2 and 12 is one possible triplet.
-155
-9
23