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Best Answer

3

12 = 2^2 x 3

21 = 3 x 7

30 = 2 x 3 x 5

hcf = 3

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Wiki User

9y ago
This answer is:
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this is helpful
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Wiki User

7y ago

The GCF is 3.

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Anonymous

Lvl 1
4y ago

6

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Q: What is the GCF of 12 21 30?
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