T
trinhthiphuong1


Hãy tính các tổng sau:
1)
[TEX]C_{20}^0 + C_{20}^1 + ... + C_{20}^{20} = ?[/TEX]
2)
[TEX]C_{20}^0 + C_{20}^4 + ... + C_{20}^{20} = ?[/TEX]
3)
[TEX]C_{20}^1 + C_{20}^3 + ... + C_{20}^{19} = ?[/TEX]
4)
[TEX]C_{20}^0 + C_{20}^2 + ... + C_{20}^{20} = ?[/TEX]
5)
[TEX]C_{20}^0 + C_{20}^3 + ... + C_{20}^{18} = ?[/TEX]
1)
[TEX]C_{20}^0 + C_{20}^1 + ... + C_{20}^{20} = ?[/TEX]
2)
[TEX]C_{20}^0 + C_{20}^4 + ... + C_{20}^{20} = ?[/TEX]
3)
[TEX]C_{20}^1 + C_{20}^3 + ... + C_{20}^{19} = ?[/TEX]
4)
[TEX]C_{20}^0 + C_{20}^2 + ... + C_{20}^{20} = ?[/TEX]
5)
[TEX]C_{20}^0 + C_{20}^3 + ... + C_{20}^{18} = ?[/TEX]