There actually isn't enough information to be able to answer the question because you need to know how many total songs he is playing the 10 at random from, but 1/90 is the correct answer for the Edge honors project
If this is a right triangle, then the sum of the squares of the two shorter sides will equal the square of the longest side: 7^2 + 9^2 = 11^2 => 49 + 81 = 121 But this is false.
