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66, 90, & 115
Reduce each number to its prime factors.
Hence
66 = 11,3,2
90 = 18,6 = 3,6,6 = 3,3,3,2,2
115 = 5,23
The HCF between 66, & 90 is 3,2 = 6
There is no common factor between 115 and 66,90.
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