Answer:
[tex]\frac{3}{14}[/tex]
Hope this is right :)
Step-by-step explanation:
Hopefully the question is asking probability.
There is a [tex]\frac{1}{2}[/tex] chance of wearing a blue shirt on Monday.
Then if you get a blue shirt on Monday, you have to wash that one.
There are now 3 blue shirts and 4 green shirts.
There is now a [tex]\frac{3}{7}[/tex] chance of getting a blue shirt.
[tex]\frac{1}{2} *\frac{3}{7} = \frac{3}{14}[/tex]