1997 PMWC Problems/Problem T2
From AoPSWiki
Problem
Evaluate
Solution
We can group them:
The sum of the first 
odd numbers is 
, so we can simplify:
That's just 
.
See also
| 1997 PMWC (Problems) | ||
| Preceded by Problem T1 | Followed by Problem T3 | |
| I: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 T: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 | ||
