top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

    Get Free Puzzle Updates

Facebook Login
Site Registration

Can you guess the ‘n’ value?

+1 vote

A boy goes to 20 of his friend’s houses with ‘n’ number of newly purchased marbles in his hands. At every house he visits , he gives away half of marbles he have and take one of his friend’s marble’s and adds it with the one’s he is left with , he never had a problem of dividing an odd number of marbles left and finally after leaving the his 20th friends house, he is left with 2 marbles, can you guess the ‘n’ value?

posted Jul 2, 2017 by Rony Chakrabortty

Share this puzzle
Facebook Share Button Twitter Share Button Google+ Share Button LinkedIn Share Button Multiple Social Share Button

2 Answers

0 votes

n=2 (irrespective of how many friends he visits)

answer Jul 3, 2017 by Kewal Panesar
0 votes

n is equal to 2.
At the end he is left with 2 marbles which implies before he received the 20th friend's marble he had 1 marble which is half of what he had when he visited the 20th friend. This means he had 2 marbles when he reached the 20th person. This logic can be applied all the way back to the point where he started out to visit his 1st friend. This means he started out with just 2 marbles.

answer Jul 3, 2017 by Tejas Naik

Similar Puzzles
0 votes

Find the largest possible value of positive integer N, such that N! can be expressed as the product of (N-4) consecutive positive integers?

0 votes

A box contains n coins, of which 7 of them are counterfeit with tails on both sides and the rest are fair coins. If one coin is selected from the bag and tossed, the probability of getting a tail is 17/20. Find the value of ‘n’.

Contact Us
+91 9880187415
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Karnataka INDIA.