Evaluate using the formula .

Subtract from .

Simplify the numerator.

Expand to .

Simplify.

Multiply by .

Multiply by .

Multiply by .

Multiply by .

Multiply by .

Multiply by .

Multiply by .

Multiply by .

Multiply by .

Multiply by .

Multiply by .

Expand to .

Divide by .

Find the Number of Possibilities 12 permute 12