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Question
Common prime factors of 30 and 250 are
Options
2 × 5
3 × 5
2 × 3 × 5
5 × 5
MCQ
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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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Factorise into primes: 117.
Common prime factors of 36, 60 and 72 are
The prime factorisation of 60 is 2 × 2 × 3 × 5. Any other number which has the same prime factorisation as 60 is
