Answer :
first we add up the number of marbles which would be 1+2+3+3=9 then we do 3/9 and get .33333333 and we would then turn it into a percent 33.33%
[tex]|\Omega|=1+2+3+3=9\\|A|=3\\\\P(A)=\dfrac{3}{9}=\dfrac{1}{3}\approx33,3\%[/tex]