Which of the following is a factor of 15 but not a factor of 12?
A
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B
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C
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D
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Solution
The correct option is C
Factors of 15 are : 1, 3, 5 and 15 Factors of 12 are : 1, 2, 3, 4, 6 and 12 We can see that 5 is a factor 15 but not a factor of 12. Hence the right answer is 5.