- The ratio of green to yellow balls in a basket is 5:7. If 15 balls of each color are added, the ratio becomes 2:3. How many yellow balls were originally th...
The probability of selecting a rotten egg randomly from a basket of 1050 eggs is 0.36. What is the number of rotten eggs in the basket?
One summer peter visits 4 villages (A, B, C and D) in a random order. Find the probability that he visits (i) A before B (ii) A before B and B before C ...
A letter is taken out at random from ‘ROORKEE’ and another is taken out from ‘BOOKKEEPER’. The probability that they are the same letter is
- Two playing cards are drawn one after another without putting the first one back. What is the probability that at least one of them is an Ace?
In a bag, the ratio of yellow and orange marbles is 4:5 respectively, and the ratio of orange and purple marbles is 1:3 respectively. If the total numbe...
A bag contains 3 black balls, 12 blue balls, and 3 yellow balls. Two balls are drawn at random. Find the probability that the two balls are blue.
There are (m + 4) red roses, (m + 9) white roses and ‘m’ pink roses in a bag. If the probability of picking a pink rose is 3/10, then find t...
A bag contains 8 white and some black balls. If the probability of drawing a black ball from the bag is twice that of drawing a white ball, find the num...
In a basket, the ratio of the number of yellow and black marbles is 4:5, respectively, and the ratio of black to white marbles is 5:6. If the total numb...
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