somebody help me this is hard for me

Answer:
[tex]\huge\boxed{\bf\: \frac{1}{3}\rightarrow probability}[/tex]
Step-by-step explanation:
Given,
We are asked to find the probability of choosing a blue marble if they are randomly chosen. Then,
Probabilty of a blue marble
= Number of blue marbles / Total number of marbles
= 2/6
= 1/3
[tex]\rule{150pt}{2pt}[/tex]