Question
30 pens are there in a box where 9 are red pens, ‘p’ are blue pens and remaining are black pens. If a pen is picked, the probability of getting blue pen is 0.5. Find the ratio of the number of blue pens and black pens.
More Probability Questions
- A coin is tossed 3 times. ‘A’ wins if exactly two heads occur. Find the probability of ‘A’ winning the game.
- Bag C contains 2 red balls and 2 blue balls, whereas bag D contains 5 red balls and 5 blue balls. One ball is drawn at random from C and transferred into D...
- 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 at le...
- 16 rotten bananas are accidentally mixed with 155 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana i...
- A box contains (x + 3) black balls, 6 yellow balls, and 5 orange balls. If two balls are selected at random and the probability of selecting two orange bal...
- Given that E and F are events such that P(E) = 0.8, P(F) = 0.4 and P(E∩ F) = 0.2. Find P(F|E).
- A coin is tossed four times one by one. What is the probability of getting a tail for the first time, head for the second time and again head for the third...
- There are black and white marbles in a jar in the ratio 4:5. After 20 marbles of each type are added, the ratio becomes 6:7. Find the original number of wh...
- A bag contains 5 red balls, 4 blue balls and 3 green balls. If one ball is drawn at random, what is the probability that the ball drawn is neither red nor ...
- If Ravi lies 4 out of 10 times and Vikram lies 6 out of 10 times, what is the probability that Ravi and Vikram will agree with each other?
Relevant for Exams:
Hey! Ask a query
Please enter email id
The email must be a valid email address.
Please enter Mobile Number
Please enter valid Mobile Number
Please enter your Doubt
Think You're Ready for RBI Grade B?
RBI Grade B 2026 Phase 1 Memory Based Paper
- 200 Questions with Detailed Solutions
- Section-wise Coverage (GA, English, Quant & Reasoning)