gcf(2448, 32) = 16
2448 = 2^4 x 3^2 x 17
32 = 2^5
hcf = 2^4 = 16
If you meant gcf of 24,48 and 30 (the comma being stripped by the system - adding a space after the comma would prevent the numbers being merged when the comma is removed):
gcf(24, 48, 32) = 8
24 = 2^3 x 3
48 = 2^4 x 3
32 = 2^5
hcf = 2^3 = 8
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