Find the Number of Possibilities 9 choose 7

Math
Evaluate using the formula .
Subtract from .
Simplify .
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Rewrite as .
Cancel the common factor of .
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Cancel the common factor.
Rewrite the expression.
Multiply by .
Simplify the denominator.
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Expand to .
Multiply by .
Divide by .
Find the Number of Possibilities 9 choose 7

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