First of all, we know that there are 10 marbles in the bags including 7 blue marbles, 2 greens marbles, and 1 red marbles. Also, we know that there total 3 marbles that are not blue which is 2 green+1 red=3 marbles, so
P(not draw a blue marbles):
3/10
Or 0.3
Or
30% are all correct answer. Hope it help!
