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Find the LCM and HCF of 6 and 20 by the prime factorisation method.

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Find the LCM and HCF of 6 and 20 by the prime factorisation method.
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We can write,
`6 = 2**3`
and `20 = 2**2**5 = 2^2**5`
So, LCM will be each of prime factor with their highest power ,
`=2^2**3**5=60`
HCF will be the common prime factor between them with least power,
`=2`
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