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Minute Math: Highest Common Factor

Can you provide the Greatest Common Divisor (GCD) or the Highest Common Factor (HCF) of these sets of numbers in under 1 minute?

By JaiminJDesai
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NumbersGCD / HCF
1, 3, 9
7, 14
12, 16, 32
4, 6, 12
9, 42
5, 50
24, 36
8, 20, 10
3, 17, 51
6, 9, 15
NumbersGCD / HCF
15, 20, 30
2, 5, 10
121, 132, 143
3, 12, 72
4, 100
100, 50, 500
13, 65
34, 153
2, 6
76, 95
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