Respuesta :
The probability that he drank 2 glasses of cola is .4
Calculation of probability:
Since There are 2 glasses of root beer and 4 glasses of cola on the counter. Dave drinks two of them at random.
So, the probability is
[tex]= 4\div 6\times 3\div 5[/tex]
= 0.4
Learn more about probability here: https://brainly.com/question/24760080