Question : The highest common factor of 120, 360, and 210 is:
Option 1: 12
Option 2: 30
Option 3: 3
Option 4: 15
Correct Answer: 30
Solution : Factors of 120 = 2 × 2 × 2 × 3 × 5 Factors of 360 = 2 × 2 × 2 × 3 × 3 × 5 Factors of 210 = 2 × 3 × 5 × 7 $\therefore$ The highest common factor of 120, 360, and 210 = 2 × 3 × 5 = 30 Hence, the correct answer is 30.
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