Evaluate using the formula .

Subtract from .

Rewrite as .

Cancel the common factor of .

Cancel the common factor.

Rewrite the expression.

Expand to .

Divide by .

Find the Number of Possibilities 18 choose 1

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# Find the Number of Possibilities 18 choose 1

Evaluate using the formula .

Subtract from .

Rewrite as .

Cancel the common factor of .

Cancel the common factor.

Rewrite the expression.

Expand to .

Divide by .

Find the Number of Possibilities 18 choose 1