Question
Nine boys have to stand in a circle. In how many ways
they are to be stand on the circumference of circle?Solution
Any boy may be stand on any place so there is no difference in clockwise and anticlockwise direction here. Requirement permutations = 1/2 × (n - 1)! => 1/2 × (9 - 1)! => 1/2 × 8! => 20160
- A wheel travels 5.28 km in 60 complete revolutions. Calculate the diameter of the wheel. (Use π = 22/7)
A bus covers some distance at a certain speed. If a person covers one-third of that distance in triple time, then the ratio of the speed of the person t...
Measure of each interior angle of a regular polygon can never be?
The volume of cone is 1267.2 cm3. If its height is 2.1 cm then find the radius of the cone.
If the length of a rectangle is extended by 25% and its width is reduced by 20%, what is the percentage difference in the rectangle's area as a result o...
A rectangular lawn is 60 meters X 50 meters and has two roads, each 2 meters wide, in the middle of it, one parallel to its length and the other paralle...
The ratio of length to breadth of a rectangle is 6:9. If the sum of the length and breadth of the rectangle is 45 cm, then find the area (cm 2
If the two adjacent sides of a rectangle are x cm and x – 10 cm and its perimeter is 68 cm then find its area?
If the length of the diagonal of a square is 9.2 cm, then the area of the square is:
Area of a rectangle is equal to the total surface area of a hemisphere having volume 2000 cm³ . Find the perimeter of the rectangle if its length is 12...
Relevant for Exams:
