NISHIO Hirokazu[Translate]
XがY = XがY以下 - XがY未満
from ABC180
XがYである場合の数は、XがY以下である場合の数 - XがY−1以下である場合の数
c(X=Y)=c(X \le Y)-c(X \le Y-1)


"Engineer's way of creating knowledge" the English version of my book is now available on [Engineer's way of creating knowledge]

(C)NISHIO Hirokazu / Converted from [Scrapbox] at [Edit]