Question

On the ground, 100 stones are placed such that the distance between the first and the second is 1m, between second and third is 3m, between third and fourth is 5 m and so on. how far will a person have to travel to bring them one by one to the basket placed at the first stone, if he starts from the basket.

Answer 1

To bring them one by one to the basket placed at the first stone, if he starts from the basket then the distance to be travelled will be all the distances twice (because he returns again)
which will be equal to twice of sum of all distances

Option 1 : Since the distances are in ap so the total distance will be
= 2 * [ Sum of all distances ]
= 2 * [ (100/2) * (2*1 + 99*2) ]
= 2 * [ 100 * 100 ]
= 20000

So, He travels 20000m or 20km .