Question
A bag contains 3 white balls, 6 black balls and 5 red
balls. Two balls are drawn simultaneously. Find the probability that both the balls are of same colour.Solution
Total number of balls in the bag = 3 + 6 + 5 = 14 Total possible outcomes = 14C2 = 91 Number of favourable outcomes = 3C2 + 6C2 + 5C2 = 3 + 15 + 10 = 28 Required probability = 28/91 = 4/13
A bag contains coins of Rs 1, 50p, and 25p and the ratio of the number of coins is 16:9:28 If the total value of all the coins is Rs 550 then what will ...
A sum of money is divided among P, Q, R and S in the ratio of 3:4:8:9 respectively. If the share of R's is Rs. 2900 more than the share of Q, then what ...
Find the mean proportion of 81 and 324.
Marks scored by A and B in a test are in the ratio 13:6 respectively. If B had scored 4 more marks, then marks scored by A would be 30% more than that o...
The incomes of A, B, and C are in the ratio 3:4:5, and their expenditures are in the ratio 2:3:4. If A saves ₹2,000, what is the income of C?
The ratio of the ages of Sneha, Ritu, and Anjali is 3:4:5 respectively. Meera is 6 years younger than Ritu. If the difference between Anjali and Sneha�...
The ratio of the number of English books to Hindi books in a library shelf is 5:4. If 140 Hindi books are written by Pradeep, which constitutes 20% of t...
Ratio of monthly income to monthly expenditure of A is 11:9, respectively and monthly savings of A is Rs. 2880. Find the monthly income of A.
Number of faculties in Physics and Biology in an institute is in the ratio of 3:5 respectively. If 75 more faculties join Physics, while 40 more faculti...
By mistake, by dividing Rupees 2256 between x, y and z in the proportion 1/3: 1/4: 1/5, it was divided in the proportion of 3:4:5. What is the differenc...
Relevant for Exams:
