All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars
 perplexus dot info

 Dates data distribution (Posted on 2015-01-05)
Consider all possible dates (formatted DD/MM/YY) within a span of a century , from 01/01/01 to 31/12/00 (20th century!).
In this period there are N k dates that can be expressed by k distinct digits, e.g. N1=1 (11/11/11).

a. Derive the values of N k for all other values of k (2 to 6).
b. What is the average k for the 20st century?
c. How about the 21st century?

 No Solution Yet Submitted by Ady TZIDON No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
 re: computer-aided solution | Comment 2 of 3 |
(In reply to computer-aided solution by Charlie)

Charlie,

Each of us committed an error, and it slightly affects your otherwise

perfect solution:

a. I wrongly defined the 20 th century, shifting it forward a year.

b. You wrongly assumed that 2100 is a leap year, and it is not.

I would appreciate it  if you modify your entry.

Thanks.

 Posted by Ady TZIDON on 2015-01-05 17:55:54

 Search: Search body:
Forums (0)