Answer:
(a) LCM of 5 and 20 2 5, 20 2 5, 10 5 5, 5 1, 1
\[\therefore \]LCM\[=2\times 2\times 5=20\] (b) LCM of 6 and 18 2 6, 18 3 3, 9 3 1, 3 1, 1
\[\therefore \]LCM\[=2\times 3\times 3=18\] (c) LCM of 12 and 48 2 12, 48 2 6, 24 2 3, 12 2 3, 6 3 3, 3 1, 1
\[\therefore \]LCM\[=2\times 2\times 2\times 2\times 3=48\] (d) LCM of 9 and 45 3 9, 45 3 3, 15 5 1, 5 1, 1
\[\therefore \] LCM\[=3\times 3\times 5=45\] Here, we observe that in all parts, LCM of the given numbers is the larger of two numbers because one number is the factor of the other number.
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