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Sagot :
Answer:
The answer is 5.
Explanation:
15:3×5
20:2×2×5
In both 15 and 20, '5' is in common. So, the numbers which are in common are called HCF ( Highest Common Factor ).
So, the HCF (well known as GCF ) of 15 and 20 will be 5.
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