Answer:
Step-by-step explanation:
2| 144
2| 72
2| 36
2| 18
3| 9
| 3
144=2×2×2×2×3×3
2 | 240
2 | 120
2 | 60
2 | 30
3 | 15
| 5
240=2×2×2×2×3×5
greatest common factor=2×2×2×2×3=48
a. 2 divides both ,so common factor
b. 3 divides both ,so common factor
c. 10 does not divide 144 so not a common factor.
d.48 divides both hence a common factor.
e. 120 does not divide 144 therefore not a common factor.
