How do you find the probability of a black ball being black?
To calculate the probability, we take the probability of the first ball being black (3 black balls in the bag, 8 balls total, so 3 8) and multiply this by the probability of the second ball being black if the first one is black (now 2 black balls in the bag and 7 total balls, so 2 7 ). Then: 3 8 ⋅ 2 7 = 6 56 = 3 28.
How do you find the probability of drawing a red ball?
Probability of drawing a first RED ball can be gotten by dividing the number of RED balls in the bag by the total number of balls in the bag. Probability of drawing a second RED ball can be gotten by dividing the number of REMAINING RED balls in the bag by the total number of balls remaining in the bag.
What is the probability that the three balls in the lottery?
If all the balls drawn from the bag are identical in colour, then there are 15 possibilities: If at least two of the balls drawn from the bag are of different colours, then the three balls are not identical in colour, so there are 205 possibilities: The probability is about 93\%.
What is the probability of 2nd ball being the other color?
The second ball must be the other color, and there are now only 5 total, of which 3 are the “other” color, and the probability is 2/5 the same color will be picked and 3/5 the other color will be picked (Potherball=3/5). Interestingly, if order is important, the probability is half as large, 3/10, for each choice of first color.
https://www.youtube.com/watch?v=d155w9TNOi8
What is the probability that a box contains 4 blue balls?
Two green balls out of five can be chosen in (5C2) = 10 ways. Four balls out of nine can be chosen in (9C4) = 126 ways. Therefore, the probability = [ (6*10) / 126] = (10 / 21). Originally Answered: A box contains 4 blue and 5 green balls.
How many white and 3 black balls are there in a bag?
After the first ball is drawn, there are 5 white and 2 black balls in the bag. ⇒ The probability of drawing a black ball is 2 7. ⇒ The probability that both the ball drawn are black is 3 8 × 2 7 = 3 28. Originally Answered: There are 5 white and 3 black balls in a bag. Two balls are randomly taken out without replacing them.
What is the probability of picking 3 white balls in chess?
To pick 1 white ball, there will be a probability of 5/12, since the total number of balls is 12. To get the probability of picking three white, we multiply the probabilities of obtaining white after each pick, until three picks.
https://www.youtube.com/watch?v=rZqfmeiV6HE