28
24
Six.
It is: 1+2 = 3
It is: 1+2+4 = 7
1, 3, 11 and 33
24
The sum is 1 plus 5 = 6
Six.
It is: 1+2 = 3
It is: 1+2 = 3
It is: 1+2+4 = 7
You need at least two numbers to find something in common between them.
1, 3, 11 and 33
The sum of all the positive factors of 12 is 28.
I think its 90
The sum of the positive whole-number factors of 30 is 72.
The odd factors of 70 are: 1, 5, 7, and 35. The sum of these factors is 48.