1308
-86
{1, 53 and 72 lots of -1} ie 1*53*-1*-1*-1 ... *-1
The numbers that multiply to 72 and add to negative 16 are -8 and -9. This is because (-8) × (-9) = 72 and (-8) + (-9) = -17. Therefore, the correct pairs are -8 and -9.
How about: 8*9 = 72 as one example
nothing
24 and 3
-86
6 + 12 = 18 6 * 12 = 72
-73
78
60
-27
-27
{1, 53 and 72 lots of -1} ie 1*53*-1*-1*-1 ... *-1
86
How about: 8*9 = 72 as one example
21