>>73
スレも板も間違ってるぞ認知症

https://egg.5ch.net/test/read.cgi/hosp/1718544450/


514:卵の名無しさん (ブーイモ MM6b-L44c [133.159.148.194 [上級国民]]):[sage]:2024/07/19(金) 08:23:59.49 ID:1dy92f2iM
f2p[n_,c_:365] := 1 - Product[x/c,{x,Range[c-n+1,c]}];
f2p[23] // N


f3p[n_,c_:365] := f2p[n,c] - Sum[Binomial[c,j] Binomial[c-j,n-2j]50!/2^j/c^n,{j,1,n/2}];

f3p[50] //N