index

id: ca0578e41cfc0c79285e66989da58e272894ba07819257a6d2c329662f087a13

id (bech32): note1egzh3equlsx8j2z7v6vfmfvwyu5ffws8sxf90fkjcv5kvtcg0gfsar5erg

sig: 1384d162d5ddf790f6552a3c1db6b784b97622070c5736c8f6cb504c8f57e37e43bb72241bbbed2a14c0d4c966711d482b3dd5f834ea55962936b62d473b86a3

created_at: 2026-01-27 17:46:43 +0900

created_at (unix time): 1769503603

content:

nPr が n*(n-1)*(n-2)*... でr個を掛け算する…のは樹形図考えたら当たり前やん?なので

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