Question
A bag contains 20 white and some black balls. If
the probability of drawing a black ball from the bag is 6.25 times that of drawing a white ball, find the number of black balls in the bag.Solution
A bag contains 16 black and 18 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
...A bag contains 7 orange balls, 8 red balls and 5 black balls. Three balls are drawn at random. Find the probability that at least two balls are red.
A bag contains 5 green gems and 7 orange gems. If 2 balls are drawn random, then what is the probability that at least 1 gem is orange.
- ‘A’ and ‘B’ play a game involving tossing a coin 4 times. ‘A’ wins if exactly two heads appear. Otherwise, ‘B’ wins. Find the probability t...
A number is chosen at random from first 20 natural numbers. Find the probability that the chosen number is prime.
A bag holds 12 pink balls and 13 white balls. If two balls are randomly drawn from the bag, what is the probability that the two balls are of different ...
Two dice are rolled. What is probability that sum is at least 10?
A box contains 10 red balls, 12 green balls, and 8 blue balls. Two balls are drawn at random. What is the probability that both balls drawn are either r...
- Sneha has a 4/9 probability of passing the exam, while Neha has a 5/7 probability of failing. What is the probability that both Sneha and Neha either pass ...
A box contains only three colors of balls- red, green, and blue. What is the minimum number of balls that should be picked from the box to ensure that a...
