The GCF is 2.
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To find the highest common factor (HCF) of 18, 32, and 48, you need to first find the prime factors of each number. The prime factors of 18 are 2 x 3^2, 32 can be broken down into 2^5, and 48 is 2^4 x 3. To find the HCF, you take the common prime factors with the lowest exponent, which in this case is 2^1 = 2. Therefore, the HCF of 18, 32, and 48 is 2.