Created
April 17, 2021 01:38
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Expected number of packs to complete an album
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| row[n_] := Table[ | |
| Binomial[n, 4-(k-n)] Binomial[180-n, k-n] / Binomial[180, 4], | |
| {k, 0, 180}] | |
| m = Table[row[k], {k, 0, 180}] | |
| r = m[[1;;180, 1;;180]] | |
| Print[N[Total[Inverse[IdentityMatrix[180] - r][[1]]]]] |
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