Question

The LCM of 12, 15, 20, 27 is
(a) 270
(b) 360
(c) 480
(d) 540

Answer 1

(d) 540

$\begin{array}{l}2\overline{)12,15,20,27}\\ 2\overline{)6,15,10,27}\\ 3\overline{)\text{3,15, 5, 27}}\\ 3\overline{)\text{1, 5, 5, 9}}\\ 3\overline{)\text{1, 5, 5, 3}}\\ 5\overline{)\text{1, 5, 5, 1}}\\ \text{1, 1, 1, 1}\end{array}$
L.C.M. = 2² × 3³ × 5 = 540