Chapter 1.1, Problem 25E

For Exercises 25–34, use inductive reasoning to find a pattern for the answers. Then use the pattern to guess the result of the final calculation, and perform the operation to see if your answer is correct.

25. $\begin{array}{l}12,345,679\times 9=111,111,111\hfill \\ 12,345,679\times 18=222,222,222\hfill \\ 12,345,679\times 27=333,333,333\hfill \\ ⋮\hfill \\ 12,345,679\times 72=?\hfill \end{array}$