25, 49 and 121
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4 and 9 have a GCF of 1
12 & 16
12 and 16
The GCF of all the composite numbers under 100 is 1. For e.g 4 & 9 are composite numbers & their GCF is 1, so if we take other composite numbers along with 4 & 9 the GCF will be 1.
16, 32 and 48