Answer:
Christopher can take 56 different groups of 5 shirts.
Step-by-step explanation:
Christopher has 8 unique shirts.
Out of these only 5 can fit in his bag.
So the number of ways in which he can choose 5 shirts from the available 8 is given by [tex]\[_{5}^{8}\textrm{C}\] [/tex]
This can be evaluated as [tex]\[\frac{8!}{5!*3!}\][/tex]
Simplifying further,
= [tex]\[\frac{6*7*8}{1*2*3}\][/tex]
= 56
So Christopher has 56 choices to select 5 shirts out of 8.