Using the Binomial Probability Calculator. You can use this tool to solve either for the exact probability of observing exactly x events in n trials, or the cumulative probability of observing X ≤ x, or the cumulative probabilities of observing X <
The probability it happens $k$ times in $n$ independent attempts is $P(k)={n \choose k}p^k (1-p)^{n-k}$. Your attempts seem to have ignored the binomial co-efficients
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