Question
Generalize Exercise 4 to the case of $n$ trials. Show that the probability of $r$ successes is $P(S=r)=\left(\begin{array}{c}n \\ n-r\end{array}\right) a^{r} b^{n-r}$.
Step 1
We want to find the probability of having exactly r successes in these n trials. Show more…
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