Which of these is a factor of 12?, 5, 6, 8, 9, Which of these is a factor of 20?, 3, 10, 11, 15, Which of these is a factor of 36?, 3, 5, 7, 8, Which of these is a factor of 21, 4, 7, 9, 12, Which of these is a factor of 18, 4, 5, 6, 7, Which of these is a not a factor of 15?, 1, 3, 4, 5, Which of these is a not a factor of 22?, 1, 9, 11, 22, Which of these is a not a factor of 20?, 2, 4, 5, 6, Which of these is a not a factor of 9?, 1, 3, 8, 9, Which of these is a not a factor of 200?, 20, 40, 50, 60.

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