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10 questions from this quiz
Trials needed for fixed successes
Number of failures
Fixed number of successes
r(1−p)p\frac{r(1-p)}{p}pr(1−p)
r(1−p)p2\frac{r(1-p)}{p^2}p2r(1−p)
P(Y≤n)=P(X≥r)P(Y \leq n) = P(X \geq r)P(Y≤n)=P(X≥r)
0.1728
It counts failures before successes
11.67
38.89
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