Number of attempts required to complete the gacha
Calculate the expected number of attempts required to complete the gacha (collect all items).
| Expected number of attempts required to collect the entire set | Times |
・It is assumed that all items have an equal drop rate.
・The expected number of attempts required for n items is:
・The expected number of attempts required for n items is:
| \(\hspace{20px}n \displaystyle \sum_{\small k=1}^{\small n}{\large \frac{1}{k}}=n\times (\frac{1}{1}+\frac{1}{2}+\ \cdots\ +\frac{1}{\large n})\) |
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