Critical Thinking Challenge!

United States
October 2, 2008 11:58pm CST
Here is a fun one... See if you can guess it. I will post the answer in 1 week! You have a list of numbers from 1 to 100, e.g. 1, 2, 3, 4, etc... Without using a calculator, how fast can you count them? I can do it in under 10 sec! Can you? If you think you know, post your answer. I will post the solution in 1 week.
3 responses
arthi_88
@arthi_88 (1516)
• India
3 Oct 08
It took me around seventeen seconds..but that was only counting and not adding up...are we suppose to add them up?
zpcrepair
@zpcrepair (64)
• United States
3 Oct 08
Yep. I am looking for the SUM of the numbers. I can get the sum in 10sec, can you?
arthi_88
@arthi_88 (1516)
• India
3 Oct 08
sure for n natural nos. it is n(n-1)/2. that is if the nos are starting from 1 and then continuous without break till n numbers..otherwise if it is in some series then may be...else you win!!
zpcrepair
@zpcrepair (64)
• United States
3 Oct 08
Ok, well, that may be so, but there is a much simpler way to do it. Thanks for submitting your answer!
zakirpro
@zakirpro (32)
•
4 Oct 08
ya count in 10
skeletonfoo
@skeletonfoo (9)
• Singapore
3 Oct 08
oh i need 14 seconds to count them. I twisted my tongue at 77 and 79