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The GCF is 1.
1/9 4/12 - 2/9 = 3/9 - 2/9 = 1/9
63-4
The David Frost Show - 1969 4-63 was released on: USA: 15 December 1971
Factors of 20: 1, 2, 4, 5, 10, 20.Factors of 63: 1, 3, 7, 9, 21, 63.GCF (20, 63) = 1