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Formula
Permutations and combinations
$\,_{ 4 }C_{ 1 }$
$4$
Find a combination
$\,_{ \color{#FF6800}{ 4 } }C_{ \color{#FF6800}{ 1 } }$
 Organize the equation using $\,_{n}C_{r} = \dfrac{\,_{n}P_{r}{r!} = \dfrac{n!}{\left(n-r\right)!r!}$
$\color{#FF6800}{ \dfrac { { 4 }! } { { \left ( 4 - 1 \right ) }! { 1 }! } }$
$\dfrac { { 4 }! } { { \left ( \color{#FF6800}{ 4 } \color{#FF6800}{ - } \color{#FF6800}{ 1 } \right ) }! { 1 }! }$
 Subtract $1$ from $4$
$\dfrac { { 4 }! } { { \color{#FF6800}{ 3 } }! { 1 }! }$
$\color{#FF6800}{ \dfrac { { 4 }! } { { 3 }! { 1 }! } }$
 Simplify the formula containing the factorial 
$\color{#FF6800}{ \dfrac { 4 } { 1 } }$
$\color{#FF6800}{ \dfrac { 4 } { 1 } }$
 Reduce the fraction to the lowest term 
$\color{#FF6800}{ 4 }$
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