What is the method to calculate the probability of at least one success in multiple independent trials?

• A. Sum of individual probabilities
• B. Product of individual probabilities
• C. 1 minus the product of failure probabilities
• D. Average of success probabilities

Answer: (C)

The method to calculate the probability of at least one success in multiple independent trials involves using the concept of complementary probability. When you want to know the probability of at least one success occurring, it can be more straightforward to calculate the probability of the complementary event, which is the probability of zero successes (or all trials failing).

To do this, you first determine the probability of failure for each individual trial, and then you find the product of these failure probabilities across all trials because the trials are independent. The cumulative probability of failing in all trials gives you the likelihood of no successful outcomes.

By subtracting this product of failure probabilities from 1, you then arrive at the probability of having at least one success. This approach effectively captures the scenario where, despite multiple attempts, you want to evaluate your chances of achieving at least one positive outcome. Hence, calculating this way accounts for the independent nature of each trial while considering all possible successful combinations across the trials.