A jar contains jellybeans. There are seven red jellybeans, seven blue jellybeans, and seven green jellybeans. You normally take out two jellybeans to eat. What is the probability that they are both blue
To find the probability of picking two blue jellybeans, we first need to find the total number of jellybeans in the jar, which is 7 (red) + 7 (blue) + 7 (green) = 21 jellybeans.
The probability of picking a blue jellybean on the first draw is 7/21 because there are 7 blue jellybeans out of the total 21.
After picking a blue jellybean, there are now 6 blue jellybeans left and 20 total jellybeans. So, the probability of picking another blue jellybean on the second draw is 6/20.
To find the overall probability of picking two blue jellybeans, we multiply the probabilities of each event:
(7/21) * (6/20) = 42/420 = 1/10
Therefore, the probability of picking two blue jellybeans from a jar containing 7 red, 7 blue, and 7 green jellybeans is 1/10.