What is the common multiple of 2 3 and 9?

Answer 1

Since 9 is a multiple of 3, to answer this question we want only the multiples of 3 that are also multiples of 9. Thus, we need not consider 3 in answering this question. Thus we want to know the common multiples of 2 and 9. For positive integers, examples are 9x2x1=18, 9x2x2=36, 9x2x3=54, 9x2x4=72, .... Keep adding 18 to get more in this infinitely large set.

This is an unusual question; was it an assignment for a class? For most math problems, it is only the least common multiple (LCM) that is needed, which is 18 for this question.

Answer 2

18