Which one of the following shapes can be used to tile (completely cover by repeating) a flat plane, extending to infinity in all directions, without leaving a...

A building has several rooms and doors as shown in the top view of the building given below. The doors are closed initially. What is the minimum number o...

Three of the five students allocated to a hostel put in special requests to the warden. Given the floor plan of the vacant rooms, select the allocation plan tha...