Question
The names of 17 students from section A, 18 students
from section B and 19 students from section C were selected. The age of all the 54 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 = 54 When 1 name was selected from 54 names, the probability that he was of section B = 18/54 = 1/3 But from the question, there are 18 students from the section B and the age of all 18 are different therefore, the probability of selecting one i.e. youngest student from 18 students will be 1/18.
If x1 and x2 are the roots of the equation 2x2 + 3x – 9 = 0, then the equation which has the roots 1/x1 and1/x2 is:
Find the surface area of the smallest cube that can perfectly fit a sphere of volume 18432Ï€ cm3 inside it. Â
There's a cone of height 12cm out of which a smaller cone with the same vertex and vertical axis is cut out. What is the ratio of the volume of the larg...
- 'A school corridor is covered with square tiles, each with a side length of 40 cm. If the corridor measures 480 cm in length and 160 cm in width, how many ...
A rectangular lawn 35m x 40m has two roads each 4metres wide, running in the middle of it, one parallel to the length and the other parallel to the brea...
The area of four walls of a room is 120 cm2. If the length and breadth of the room were equal and the height of the room is 5 cm, then what i...
A right-angled triangle has legs of lengths 9 cm and 12 cm. Find its hypotenuse, area and perimeter.
The radius of a cylindrical tank is 7 meters, and its height is 14 meters. How much water will it take to fill the tank to half its capacity?
A rectangular reservoir of 2800 m3 capacity has length and height equal to 10 m and 40 m respectively. if 420 m3 of water is taken...
The perimeter of a rectangular field is 20 metres and its area is 18 m2 . What is the length of the diagonal of this field?
Relevant for Exams:
