The GCF is 3.
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To find the Greatest Common Factor (GCF) of 15, 33, and 54, we first need to list the factors of each number. The factors of 15 are 1, 3, 5, and 15. The factors of 33 are 1, 3, 11, and 33. The factors of 54 are 1, 2, 3, 6, 9, 18, 27, and 54. The GCF is the largest number that is a factor of all three numbers, which in this case is 3.