The image contains a probability-related problem in German.

Part (c):

The probability $P(B)$ is given by the following equation: $P(B) = 1 - \left( \binom{12}{12} \cdot 0.73^{12} \cdot (1-0.73)^0 \right) \cdot \left( \binom{12}{11} \cdot 0.73^{11} \cdot (1-0.73)^1 \right)$ This involves a calculation of probabilities involving binomial coefficients and powers of $0.73$ and $1-0.73$.

You are asked to describe the event $B$ for which this equation computes the probability. The structure suggests that it could be related to the number of people in a group of 12 who exhibit a certain behavior (e.g., using a certain website or service). The event $B$ likely describes the scenario where a specific number of individuals from the group either do or do not perform a certain action (like searching for medical information online).

Part (d):

In this part, there are 12 people in a medical practice, of which 7 use Medinet for medical questions. The task is to calculate the probability that, among three randomly called individuals, at most two will use Medinet. This requires calculating the probability for various possible outcomes, taking into account the distribution of Medinet users among the total number of individuals.

Would you like me to help you break down the specific calculations for both parts (c) and (d)?