Here’s the solution to the problem of two posts ago: Which number follows in the series 10, 9, 60, 90, 70, 66? First, let’s analyze the numbers we have:
Ten Nine Sixty Ninety Seventy SixtySix
Looking at them this way, you can see that TEN is the maximum number for which three characters are used. NINE is the maximum number with four characters, SIXTY the maximum with five characters, NINETY the maximum with six characters, SEVENTY the maximum with seven characters, and SIXTY SIX the maximum with eight characters… Therefore… what’s the largest number of exactly nine characters? 96 (ninety-six).
Interestingly, once again, with the proper visualization, the solution is immediate.
Power to Visibility! (Which means… power to you!)
The Visibility Blog by Raul Cristian Aguirre 
I found out that this is one of the questions asked in interview to enter at Google, and maybe one of the most difficult !
http://mathworld.wolfram.com/news/2004-10-13/google/ (question 20)
http://www.forbes.com/sites/danschawbel/2012/01/10/the-secret-to-getting-a-job-at-google-revealed/
Sure. I should have given credit to Google I suppose. Sorry, Larry and Sergey. Thanks Adrien for the reminder.
Sorry to bother, but one milion has nine characters and is sligthly bigger that ninety six.
Well, yes, “one milion” has nine characters. But one million has ten.
🙂
Regards Eduard!
ooops!! Sorry!! Maybe that’s why I don’t work for Google.