a) Viết số hạng tổng quát của dãy số nguyên dương mà mỗi số hạng của nó chia cho \(7\) đều có số dư là \(3\).
b) Viết số hạng tổng quát của dãy số \(u_{n}\) được cho dưới dạng công thức truy hồi:
\(\begin{cases}u_{1}=1 \\ u_{n+1}=1+\frac{1}{3}u_{n}\forall n\in N* \end{cases}\)
a) \(u_{n}=7(n-1)+3, n\in N\)*.
b) \(u_{n}=1+\frac{1}{3}+\frac{1}{3^{2}}+...+\frac{1}{3^{n-1}}\)

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