From the urn in which there are 3 black and 7 white balls take out 2 balls, what is the probability that both balls will be black?
| March 4, 2021 | education
The total number of balls in the urn is 3 + 7 = 10.
The probability of removing the black ball at the first withdrawal is 3/10, the probability of removing the black ball at the second withdrawal, provided that the black ball was also drawn first 2/9.
The probability that both balls will be black is equal to the product of the probabilities that a black ball was drawn during the first extraction and the second extraction:
3/10 * 2/9 = 1/15.
Answer: 1/15.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.
