Table of Contents
What is the probability of selecting 4 balls from a bag?
This probability is 4/10=0.4.
What is the probability that all balls are red?
Therefore the probability of getting a red ball or a white ball is 4/5. Therefore the probability of getting a black ball or a white ball is 11/20. Therefore the probability of getting exactly one red ball is 99/190. Therefore the probability of getting at most one red ball is 77/95.
How do you solve for nCr probability?
How Do you Use NCR Formula in Probability? Combinations are a way to calculate the total number of outcomes of an event when the order of the outcomes does not matter. To calculate combinations we use the nCr formula: nCr = n! / r! * (n – r)!, where n = number of items, and r = number of items being chosen at a time.
What is the probability of getting two balls of the same colour?
Therefore the probability of getting one red and other white ball is 63/190 Therefore the probability of getting one red and other black ball is 18/95 Therefore the probability of getting one white and other black ball is 14/95. Let J be the event of getting balls of same colour.
What is the probability of getting a black ball or white?
Therefore the probability of getting a black ball or a white ball is 11/20. An urn contains 9 red, 7 white, and 4 black balls. All balls are identical. Two balls are drawn at random from the urn.
What is the probability of getting at most one red ball?
2 red balls out of 11 non-red balls can be drawn by 11 C 2 ways ∴ n (D) = 9 C 1 x 11 C 1 = 9 x 11 Therefore the probability of getting exactly one red ball is 99/190. Let E be the event of getting at most one red ball There are two possibilities
How many red balls can be drawn by 11 non-red balls?
2 red balls out of 11 non-red balls can be drawn by 11 C 2 ways Let D be the event of getting exactly one red ball i.e. one red and 1 non red ball 2 red balls out of 11 non-red balls can be drawn by 11 C 2 ways ∴ n (D) = 9 C 1 x 11 C 1 = 9 x 11 Therefore the probability of getting exactly one red ball is 99/190.
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