Q17. - Algebra 2

Question

Evaluate each expression

 

$C\left(8,4\right)$

Step-by-Step Solution

Answer

The value of $C\left(8,4\right)=70$.

Step 1. Given Information.

Given to evaluate the expression $C\left(8,4\right)$.

Step 2. Calculation .

When n objects are available and r are to be picked then the number of combinations is given by $C\left(n,r\right)=\frac{n!}{\left(n-r\right)!r!}$

Here n=8,r=4

Plugging the values:

 $\begin{array}{l}C\left(8,4\right)=\frac{8!}{\left(8-4\right)!4!}\\ C\left(8,4\right)=\frac{8!}{4!4!}\\ C\left(8,4\right)=\frac{8\cdot 7\cdot 6\cdot 5\cdot 4!}{4\cdot 3\cdot 2\cdot 1\cdot 4!}\\ C\left(8,4\right)=70\end{array}$

Step 3. Conclusion .

Hence, the value of $C\left(8,4\right)=70$.