Answer:
126
Step-by-step explanation:
This is a problem of combination in which we have to select 5 things(shirts) out of 9 things(shirts).
This can be done by [tex]^9c_{5}[/tex] which is calculated by
[tex]9!/5!*(9-5)![/tex]
=> [tex]9*8*7*6*5!/5!*4![/tex]
=>9*8*7*6/4*3*2*1= 126
Therefore omar can take 126 different groups of 5 shirts with him.
