Evaluate ${ } _ { n } C _ { r }$ using the formula from this section. ${ } _ { 6 } C _ { 1 }$
A)8
B)7
C)9
D)10
E)6

Name: Evaluate ${ } _ { n } C _ { r }$ using the formula from this section. ${ } _ { 6 } C _ { 1 }$ A)8 B)7 C)9 D)10 E)6
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Question

Evaluate ${ } _ { n } C _ { r }$ using the formula from this section.   ${ } _ { 6 } C _ { 1 }$  
A)8
B)7
C)9
D)10
E)6

Quizplus · Accepted Answer

The formula for combinations is ${ } _ { n } C _ { r } = \frac{n!}{r!(n-r)!}$. For ${ } _ { 6 } C _ { 1 }$, it is $\frac{6!}{1!(6-1)!} = \frac{6}{1} = 6$.

Evaluate nCr{ } _ { n } C _ { r }n​Cr​

Evaluate ${ } _ { n } C _ { r }$