**What numbers are in the next line of the sequence?**

#### Solution

Each row of numbers describes the previous row. For example, since in the first row there is a 1, the description of the second row will be: a one = 11. The third row describes the second row in which there are two numbers one, that is: two ones = 21 and so on to the new row in which we describe the last row that appears in the pyramid, that is: a three, two ones, a three, a one, a two, three ones, a three, a one, two doses and a one or which is the same: **13211311123113112211**