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Question
Common prime factors of 36, 60 and 72 are
Options
2 × 2
2 × 3
3 × 3
3 × 2 × 2
Solution
3 × 2 × 2
Explanation;
Hint:
Prime factors of 36 are 2 × 2 × 3 × 3
Prime factors of 60 are 2 × 2 × 3 × 5
Prime factors of 72 are 2 × 2 × 2 × 3 × 3
∴ Common prime factors are 2 × 2 × 3
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