Start learning 50% faster. Sign in now
Total number of balls = 8 + 5 + 7 = 20. The total number of ways to choose 2 balls from 20 is: C(20, 2) = (20 × 19) / 2 = 190. Now, the number of ways to choose 2 balls of different colors: Red and Green: 8 × 5 = 40 Red and Blue: 8 × 7 = 56 Green and Blue: 5 × 7 = 35 So, the total number of ways to choose 2 balls of different colors = 40 + 56 + 35 = 131. Therefore, the probability is: P(different colors) = 131 / 190 Correct Option: a)
Two numbers are less than a third number by 25% and 31% respectively. Find the percent by which the second number is less than the first.
The marks scored by a boy in three subjects are in the ratio 4 : 5 : 3. Boy scored an overall aggregate of 80% in the exam. If the maximum marks in each...
The population of a city is decreased by 20% in the first year and then increased by 30% in the second year. Find the population of the city at the end...
The income of ‘A’ increases by 30% every year. If his income 3 years hence from now will be Rs. 34273.2, then find his income a year before from now...
Ravi allocated 60% of his income to expenses in May. In June, his savings increased by 20%, amounting to Rs. 5760. Calculate Ravi's total income for the...
Rajesh spent 46% of his monthly income on food and 54% of the remaining of study. If total monthly savings (after spending on food and study) of Rajesh ...
A man donated 20%, 15% and 24% of his income to three NGOs ‘A’, ‘B’ and ‘C’, respectively. They spent 75%, 80% and 50% of respective sums re...
Rajesh spent 47% of his monthly income on food and 53% of the remaining of study. If total monthly savings (after spending on food and study) of Rajesh ...
Amit scored 80 marks in subject X. He scored 60% marks in subject B and Y marks in subject D. Maximum marks in each subject was 300. The overall percent...