问题:
求证:
C
0n
+3
C
1n
+5
C
2n
+…+(2n+1)
C
nn
=(n+1)2n.
求证:
+3
+5
+…+(2n+1)
=(n+1)2n.
C | 0n |
C | 1n |
C | 2n |
C | nn |
参考答案: