3.   Find first three common multiples of :       (a)  6 and 8           (b) 12 and 18

Explanation

To find the first three common multiples of the numbers given in the question, we will follow these steps:

### Part (a): Common multiples of 6 and 8

**Step 1: List the multiples of 6.**
- The first ten multiples of 6 are:
- 6 × 1 = 6
- 6 × 2 = 12
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