Evaluate ${ } _ { n } C _ { r }$ using the formula from this section. ${ } _ { 11 } C _ { 0 }$
A)11
B)1
C)55
D)165
E)330

Name: Evaluate ${ } _ { n } C _ { r }$ using the formula from this section. ${ } _ { 11 } C _ { 0 }$ A)11 B)1 C)55 D)165 E)330
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Question

Evaluate ${ } _ { n } C _ { r }$ using the formula from this section.   ${ } _ { 11 } C _ { 0 }$  
A)11
B)1
C)55
D)165
E)330

Quizplus · Accepted Answer

The combination formula is ${ } _ { n } C _ { r } = \frac{n!}{r!(n-r)!}$. For ${ } _ { 11 } C _ { 0 }$, it simplifies to $\frac{11!}{0!(11-0)!} = \frac{11!}{11!} = 1$.

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

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