<PRE><B>Question 1105615</B>
50 balls
1.20/50 or 2/5
2.White or yellow so 15/50 or 3/10
3.not to be white 40/50 or 4/5
4.to be yellow 5/50 or 1/10
5.To be red, white or yellow, 30/50 or 3/5
===
1.10/50*10/50 or 1/25
2.15/50*10/50 which is 3/50.
3.0.9^0.81
4.Red or white is 1/2 ^2=1/4; red and white is 3/10*1/5 or 3/50.
5.30/50 or 3/5
6.1/10
7.first2/5*second 2/5=4/25 for both and 2/5*3/5 plus 3/5*2/5=12/25 for 1, total is 16/25 for at least one ball to be blue.
8.not clear.
9.1/5*4/5=4/25
10.one red ball is 3/10. Only 1 is 3/10*7/10 + 7/10*3/10  or 42/100 or 0.42.</PRE>