Compute the sum
\[\sum_{i = 0}^\infty \sum_{j = 0}^\infty \frac{1}{(i + j + 1)(i + j + 2)(i + j + 3)(i + j + 4)(i + j + 5)(i + j + 6)(i + j + 7)}.\]
Question:
Compute the sum
\[\sum_{i = 0}^\infty \sum_{j = 0}^\infty \frac{1}{(i + j + 1)(i + j + 2)(i + j + 3)(i + j + 4)(i + j + 5)(i + j + 6)(i + j + 7)}.\]
Answer:
Let's think step by step.

user
\frac{1}{3600}
Compute the sum
\[\sum_{i = 0}^\infty \sum_{j = 0}^\infty \frac{1}{(i + j + 1)(i + j + 2)(i + j + 3)(i + j + 4)(i + j + 5)(i + j + 6)(i + j + 7)}.\]
train