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To find the Greatest Common Factor (GCF) of 15, 40, and 65, we first need to find the prime factors of each number. The prime factors of 15 are 3 and 5, of 40 are 2, 2, 2, and 5, and of 65 are 5 and 13. To find the GCF, we identify the common factors among the numbers, which are 5. Therefore, the GCF of 15, 40, and 65 is 5.
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