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Question
Find the HCF of the following number.
81, 99
Solution
Factors of 81: 1, 3, 9, 27, 81
Factors of 99: 1, 3, 9, 11, 33, 99
Common factors of 81 and 99: 1, 3, 9
∴ HCF of 81 and 99 = 9
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