问题
填空题
|
答案
lim n→∞
+C 12
+…+C 23 C n-1n
+C 22
+…+C 23 C 2n
=lim n→∞ 2+3+…+n C 2n+1
=lim n→∞
(n+2)n-1 2 n(n+1) 2
=lim n→∞ n2+n-2 n2+n
=1．
故答案为：1．
搜题请搜索小程序“爱下问搜题”
|
lim n→∞
+C 12
+…+C 23 C n-1n
+C 22
+…+C 23 C 2n
=lim n→∞ 2+3+…+n C 2n+1
=lim n→∞
(n+2)n-1 2 n(n+1) 2
=lim n→∞ n2+n-2 n2+n
=1．
故答案为：1．