✨ 最佳解答 ✨ @Ganymede＋ 7年以上以前 r(1) =(-6)×(-5)×(-4)×(-3)×(-2)×(-1)×0×1×2 ×... =0 @Ganymede＋ 7年以上以前 but i calculated r(1) using WolframAlpha, result : product dose not converge http://m.wolframalpha.com/input/?i=∏+%28-6%2Bk%29%2C+%28k%3D0%2C∞%29 留言
but i calculated r(1) using WolframAlpha,
result : product dose not converge
http://m.wolframalpha.com/input/?i=∏+%28-6%2Bk%29%2C+%28k%3D0%2C∞%29