likely.
The probability of choosing a blue marble is 5 in 15 or 1 in 3. The probability of then choosing a green marble is 5 in 14. (One is missing) Multiply the two probabilities and you get 5 in 42.(P = 0.1190... about 12%).
100%
You aren't close to providing enough information.
This is the same as the probability of choosing either a red of a blue marble. There are 5+4 out of 15 ways of doing this. The probability is therefore 9/15 = 3/5.
There are 16 marbles total and 7 green ones, so the probability is 7/16.
The probability of choosing a green marble from this jar would be 6/15. You get this answer by adding up the sum of all the marbles.
1/3
If one marble is chosen at random, the probability is 6/(4+6+5) = 6/15 = 2/5
5:16
1/3 or 33%
Since you haven't seen fit to tell us problem 2, we'd only be guessing.
On a single blind draw, it's 4/20 = 20% .