Question 113194
Let's start with a table of what is in the bag so that we can readily see what is available:

{{{matrix( 7, 2,
15, 1*red,
26, 1*green,
10, 1*blue,
5, 1*blue*1*green,
7, 1*red*1*green,
63, Total*stripes,
37, No*stripes)}}}

To get the 63, I just added all of the numbers given, and to get the 37, I subtracted 63 from 100, the total number of marbles in the bag.


There are 15 plus 26 plus 10 marbles that have exactly one stripe, so the probability of selecting a marble that has exactly one stripe is {{{51/100}}} or 51%.


There are 12 marbles that have exactly two stripes, so there are {{{12/100}}} ways to pick one of those, so the probability is 12%.


Given the pattern I've established you should be able to calculate the remaining probabilities in the question.


Hope this helps,
John