Question

Find the difference between the lcm of • 21, 28 and 42 and 7,2 and 3 ​

Answer 1

42.

Explanation:

21 = 3*7

28 = 2*2*7

42 = 2*3*7

So the LCM of these 3 numbers = 2*2*3*7 = 84.

LCM of 2, 3 and 7

= 2*3*7 = 42.

So the difference is 84-42

= 42.