Which of the following is a factor of 90 but not a factor of 75?
A
15
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B
5
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C
30
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D
3
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Solution
The correct option is C 30 Factors of 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90.
Factors of 75 are: 1, 3, 5, 15, 25 and 75.
So, out of the given options, 30 is a factor of 90 but not a factor of 75.
Hence the right answer is 30.