Prob(first ball being blue) = 6 / (6 + 3 + 3) = 6/12 = 1/2
Prob ( picking a yellow ball) = 3 /12 = 1/4
As the 2 events are independent the probabilities are multiplied
So the answer is 1/2 * 1/4 = 1/8
The answer is 7.3 or in other words 7 3/10
Hope I helped
The common ratio is the fifth term divided by the fourth term: -40/-8 = 5.
The seventh term is :