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Question
Common prime factors of 30 and 250 are
Options
2 × 5
3 × 5
2 × 3 × 5
5 × 5
Solution
2 × 5
Explanation;
Hint:
Prime factors of 30 are 2 × 3 × 5
Prime factors of 250 are 5 × 5 × 5 × 2
∴ Common prime factors are 2 × 5
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