### Home > A2C > Chapter 12 > Lesson 12.4.1 > Problem 12-161

12-161.

Use Pascal’s Triangle to expand

Recall Pascal's Triangle. Pascal's triangle, up to n, = 5, where the first row is, n, = 0. Last row is 1, 5, 10, 10, 5, 1.

What row is needed to expand

Use the pattern for

Now substitute for

*and*

*for*

*.*