Question

A building has 100 doors. Initially all were closed. Doors numbered 1,2,3,4 ....Were opened , then doors numbered 2,4,6,8 ...... Were closed. This continuedtill only the 100th door is flipped. What would be the state of door number 41 ?

Answer 1

the door no. 41 will be open door because first all the doors numbered 1,2,3,4.... were opened then the doors numbered as even numbers were closed and it is continued till 100th door so the odd numbered doors would be opened so the door no. 41 is a odd numbered door so it will be open