Puzzles:
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121-130
131-140
141-150
151-160
Index
|
Home
About
Accessibility
Answer to puzzle 104: An arbitrary sum
|
a
1
− b
1
|
+
|
a
2
− b
2
|
+ ... +
|
a
n
− b
n
|
= n
2
.
