box has 1 red marble, 3 blue marbles, and 4 green marbles. Maya draws a blue marble randomly from the box, replaces it, and then draws another marble randomly. What is the probability of drawing 2 blue marbles in a row?

Add all the types of marbles:

1+3+4 = 8 marbles in total

there are 3 out of 8 marbles

so the probability of pulling out a blue marble is 3 out of 8.

maya pulls one out so there is one less blue marble

so now the probability would be the total of marbles left over how many blue marbles there are

so it would be 2/7

The answer is just - 1 from blue