/ / n\
|b_1*\1 - q /
|------------ for q != 1
S = < 1 - q
|
| b_1*n otherwise
\ $$S = \begin{cases} \frac{b_{1} \cdot \left(1 - q^{n}\right)}{1 - q} & \text{for}\: q \neq 1 \\b_{1} n & \text{otherwise} \end{cases}$$
/ 11\
12*\1 - 2 /
S11 = ------------
1 - 2 $$S_{11} = \frac{12 \cdot \left(1 - 2^{11}\right)}{-2 + 1}$$
Произведение первых n-членов
[src]$$P_{n} = \left(b_{1} b_{n}\right)^{\frac{n}{2}}$$
$$P_{11} = \left(12 \cdot 12288\right)^{\frac{11}{2}}$$
P11 = 26769697770909089301459369984
$$P_{11} = 26769697770909089301459369984$$