Question
The names of 8 students from section A, 9 students from
section B and 10 students from section C were selected. The age of all the 27 students was different. Again, one name was selected from them and it was found that it was of section B. What was the probability that it was the youngest student of the section B?Solution
The total number of students = 27 When 1 name was selected from 27 names, the probability that he was of section B = 9/27 = 1/3 But from the question, there are 9 students from the section B and the age of all 9 are different therefore, the probability of selecting one i.e. youngest student from 9 students will be 1/9.
- Bhuvan can finish a task by himself in 15 days, while when working together, Anoop and Bhuvan can complete the same task in 8 days. Anoop starts the work a...
A Mahalaxmi tourist bus with only the driver inside has a speed of 60 kmph. Its maximum speed reduces by a quantity which is directly proportional to th...
Karan can do 80% works in 40 days. Remaining work completed by Karan and Arjun in 6 days. In how many total days the total work is finish if Arjun work ...
Rohan can finish a task alone in 24 days. Shreya can do 50% of the same task alone in 12 days. If Shreya and Tanya work together, they can complete 60% ...
P can do a piece of work in 12 days, Q can complete double the work in 20 days and R can do the work in 15 days. If all of them together earn Rs. 2500, ...
8 men can finish a work in 15 days. In how many days can 12 men finish the same work? (Same efficiency)
A certain Sales target was assigned to a team of men to complete in 18 days. But 8 men did not turn up for the target and the rest men complete the sale...
Worker A can build a wall alone in 30 days. When A and B work together, they can complete the wall in 16 days. If B starts building the wall alone and w...
‘A’ and ‘B’ together can complete a work in 12 days, while ‘B’ and ‘C’ together can complete the work in...
X can do a piece of work in 25 days. He worked at it for 5 days and then Y finished it in 24 days. In how many days can X and Y together finish the work?
Relevant for Exams:
