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Answer :
(a) 9 and 4
It is co prime number then LCM = product of the number
LCM = 9 × 4 = 36
(b) 12 and 5
LCM = 12 × 5 = 60
(c) 6 and 5
LCM = 6 × 5 = 30
(d) 15 and 4
LCM = 15 × 4 = 60
Yes in each case the LCM of given numbers is the product of these numbers.