Answer:1/19
Step-by-step explanation:
Number of red balls: 5
Number of green balls: 6
Number of yellow balls: 9
Total number of balls= 5+6+9= 20
Let probability of red balls = Pr(red balls)
PR(red balls)= 5/20
Hence probability of picking first ball as red = 5/20
Probability of picking second ball without replacing the first ball:
This implies that by picking second ball to be red, the number of red ball would decrease by 1. Also the total number of balls would also decrease by 1 because it isn't replaced.
PR(2nd ball) = 4/19
Pr(1st ball red and 2nd ball red)= 5/20 * 4/19
=(5*4)/(20×19)
20/(20/19)
= 1/19
