What is the sum of all possible \binom{i}{j} subject to the restrictions that i \geq 10, j \geq 0, and i+j \leq 20 ? Count different i, j that yield the same value separately - for example, count both \binom{10}{1} and \binom{10}{9}.
What is the sum of all possible \binom{i}{j} subject to the restrictions that i \geq 10, j \geq 0, and i+j \leq 20 ? Count different i, j that yield the same value separately - for example, count both \binom{10}{1} and \binom{10}{9}.