Evaluate using the formula .

Subtract from .

Rewrite as .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Multiply by .

Find the Number of Possibilities 19 permute 2

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# Find the Number of Possibilities 19 permute 2

Evaluate using the formula .

Subtract from .

Rewrite as .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Multiply by .

Find the Number of Possibilities 19 permute 2