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Find the HCF and the LCM of 81 and 237.

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9, 6399

9,2133

3, 6399

3, 2133

answer is C.

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Detailed Solution

Concept- In order to get the LCM and HCF we must first know their factors.
We can get the factors by prime factorisation method.
With prime factorisation we can get the prime factors of that number.
Factors of 81:

Factors of 237:

GCF of 81 and 237 will be:

Because 81 and 237 have only 3 as their common factor.
LCM of 81 and 237:

We can also find LCM using this formula:

P and Q are given numbers.
Question Image

Hence, the correct answer is option 3.

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