(a) L.C.M. of 9 and 4
= 2 x 2 x 3 x 3 = 36
(b) L.C.M. of 12 and 5
= 2 x 2 x 3 x 5 = 60
(c) L.C.M. of 6 and 5
= 2 x 3 x 5 = 30
(d) L.C.M. of 15 and 4
= 2 x 2 x 3 x 5 = 60
Yes, the L.C.M. is equal to the product of two numbers in each case.
And L.C.M. is also the multiple of 3.