In an experiment,a person gets success alpha | vedclass

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Question

(B) The probability of success in a single trial is $p = \frac{\alpha}{\beta}$.The probability of failure in a single trial is $q = 1 - p = \frac{\bet

Vedclass · Accepted Answer

$\frac{(\beta-\alpha)^{n-1}}{\beta^n}(n \alpha+\beta-\alpha)$

Vedclass · Answer

(B) The probability of success in a single trial is $p = \frac{\alpha}{\beta}$.The probability of failure in a single trial is $q = 1 - p = \frac{\beta - \alpha}{\beta}$.We need the probability of failing at least $(n-1)$ times in $n$ trials,which means failing $(n-1)$ times or failing $n$ times.This is equivalent to succeeding at most $1$ time.Using the binomial distribution formula $P(X = k) = {}^{n}C_{k} p^k q^{n-k}$:$P(X \le 1) = P(X = 0) + P(X = 1)$$P(X = 0) = {}^{n}C_{0} p^0 q^n = 1 \cdot 1 \cdot \left(\frac{\beta - \alpha}{\beta}\right)^n = \frac{(\beta - \alpha)^n}{\beta^n}$$P(X = 1) = {}^{n}C_{1} p^1 q^{n-1} = n \cdot \left(\frac{\alpha}{\beta}\right) \cdot \left(\frac{\beta - \alpha}{\beta}\right)^{n-1} = \frac{n \alpha (\beta - \alpha)^{n-1}}{\beta^n}$Adding these probabilities:$P = \frac{(\beta - \alpha)^n + n \alpha (\beta - \alpha)^{n-1}}{\beta^n}$$P = \frac{(\beta - \alpha)^{n-1} [(\beta - \alpha) + n \alpha]}{\beta^n}$$P = \frac{(\beta - \alpha)^{n-1} (n \alpha + \beta - \alpha)}{\beta^n}$Thus,option $B$ is correct.

In an experiment,a person gets success $\alpha$ times out of $\beta$ trials. If the experiment consists of $n$ trials,then the probability that he fails at least $(n-1)$ times is

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