IntegerSolution
Bijection
AIME
Intermediate
2011
Define an ordered quadruple of integers $(a, b, c, d)$ as interesting if $1 \le a < b < c < d \le 10$, and $a+d>b+c$. How many interesting ordered quadruples are there?
The solution for this problem is available for
$0.99.
You can also purchase a pass for all available solutions for
$99.