If we randomly select one ball from each box what is the

Question

We have four boxes, each of which contains 10 coloured balls:

• Box 1 contains 4 red balls, 5 green balls and 1 yellow ball. Box 2 contains 3 red balls, 5 green balls and 2 yellow balls. Box 3 contains 2 red balls, 5 green balls and 3 yellow balls. Box 4 contains 1 red ball, 5 green balls and 4 yellow balls

1. If we randomly select one ball from each box, what is the probability of selecting exactly one yellow ball 
2. If we randomly select one ball from each box, what is the probability of selecting at least one yellow ball