Question 169455
a) Find P( 8,5) 
<pre><font size = 4 color = "indigo"><b>
Start with 8 and multiply by 1 less each time until 
you have 5 factors,

like this:

{{{P(8,5)=8*7*6*5*4=6720}}}

</pre></b></font>
b) Find C( 8,5)
<pre><font size = 4 color = "indigo"><b>
{{{C(8,5) = P(8,5)/5! = (8*7*6*5*4)/(5*4*3*2*1)}}}

Cancel the {{{5}}}'s and the {{{4}}}'s:

{{{(8*7*6*cross(5)*cross(4))/(cross(5)*cross(4)*3*2*1)}}}

Cancel the {{{3*2}}} and the {{{6}}}

{{{(8*7*cross(6)*cross(5)*cross(4))/(cross(5)*cross(4)*cross(3*2)*1)}}}

{{{8*7=56}}}

Edwin</pre>