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Recall the formula _n C_r = n!(n-r)! r!.
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To evaluate the given combination, we will use the corresponding formula. _n C_r = n!/(n-r)! r! We are given that n= 12 and r= 7. Let's substitute these values into the formula.
n= 12, r= 7
Subtract term
Write as a product
Cancel out common factors
Multiply
Calculate quotient
