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Recall the formula _n C_r = n!(n-r)! r!.
6
To evaluate the given combination, we will use the corresponding formula. _n C_r = n!/(n-r)! r! We are given that n= 6 and r= 1. Let's substitute these values into the formula.
n= 6, r= 1
Subtract term
1!=1
n!=n* (n-1)!
Cancel out common factors
