Evaluate using the formula .

Subtract from .

Rewrite as .

Cancel the common factor of .

Cancel the common factor.

Rewrite the expression.

Multiply by .

Simplify the denominator.

Expand to .

Multiply by .

Divide by .

Evaluate 4 choose 2

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# Evaluate 4 choose 2

Evaluate using the formula .

Subtract from .

Rewrite as .

Cancel the common factor of .

Cancel the common factor.

Rewrite the expression.

Multiply by .

Simplify the denominator.

Expand to .

Multiply by .

Divide by .

Evaluate 4 choose 2