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Question
Which of the following is a factor of 90 but not a factor of 75?
Which of the following is a factor of 90 but not a factor of 75?
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Solution
The correct option is C
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.
Factors of 30 are: 1, 2, 3, 5, 6, 10, 15 and 30
So, 30 is a factor of 90 but not a factor of 75.
Hence the right answer is 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.
Factors of 30 are: 1, 2, 3, 5, 6, 10, 15 and 30
So, 30 is a factor of 90 but not a factor of 75.
Hence the right answer is 30.
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