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10-145.

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 Added to the triangle, row 7, 1, 7, 21, 35, 35, 21, 7, 1.

Now substitute for and for .