Question 935555
This is a permutation problem, so you can use the formula for permutation

{{{(5!)/((5-3)!)}}}
{{{(5*4*3*2*1)/(2!)}}}
{{{(5*4*3*2*1)/(2*1)}}}
{{{(5*4*3)=60}}}

So there are 60 ways possible of arranging 3 of 5 objects in a row.

:D