\[C_{1000}^{500} = \frac{1000!}{500!(1000 - 500)!} =\]
\[= \frac{1000!}{500! \bullet 500!}.\]
\[1)\ В\ числителе:\]
\[a_{1} = \frac{1000}{7} = 142;\]
\[a_{2} = \frac{1000}{49} = 20;\]
\[a_{3} = \frac{1000}{343} = 2;\]
\[a = 142 + 20 + 2 = 164.\]
\[2)\ В\ знаменателе:\]
\[a_{1} = \frac{500}{7} = 71;\]
\[a_{2} = \frac{500}{59} = 10;\]
\[a_{3} = \frac{500}{343} = 1;\]
\[a = 2(71 + 10 + 1) =\]
\[= 2 \bullet 82 = 164.\]
\[Ответ:\ \ нет.\]