Find the LCM of the following numbers by prime factorisation method.
$12$ and $15$

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Solution

Prime factors of the given number are,
$12 = 2 \times 2 \times 3$
$15 = 3 \times 5$

Therefore, the $L C M$ of $12$ and $15$ is,
$= 2 \times 2 \times 3 \times 5 = 60$

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