The probability of not getting any blue marbles on the first draw is 5/8. The probability of not getting any blue marbles on the second draw is also 5/8.
So the probability of not getting any blue marbles on either draw is (5/8) x (5/8) = 25/64.
Since we want to find the probability of getting at least 1 blue, we can subtract the probability of not getting any blue from 1:
1 - 25/64 = 39/64
So the probability of getting at least 1 blue is 39/64.