9
The numbers are 15 and 3. 15 * 3 = 45 15 + 3 = 18
3*5=15 5*3=15 15*1=15
11/15.
3+6+9...+45taking 3 common3(1+2+...+15) = 360
9
15
15
The numbers are 15 and 3. 15 * 3 = 45 15 + 3 = 18
3*5=15 5*3=15 15*1=15
3 (21+5)
-3+(-12) = -15
1 + 15 + 3 + 5 = 24
Get real, same as 3 x 15...
The sum of the first 5 numbers is 15. 1+2+3+4+5=15
If 1,2,3,4,5, is a sequence, then the sum is 1+2+3+4+5 = 15
It is: 2/15 plus 3/9 = 7/15