Glass jar contains 6 red, 4 green, 3 blue, and 5 yellow marbles. if a single marble is chosen at random from the jar, what is the probability that it is blue or green?

So the total number of marbles is 18 (6+4+3+5) right?

So we have 4 green and 3 blue marbles.

So together we have 7 marbles that we want to get right?

Now 7/18 is the chance that this will happen.

So ans:7/18