Answers

硬貨→表と裏の2パターン 
3枚のうち、表が出る硬貨2枚を決めます
(もしくは裏が出る硬貨1枚でもいい)
3枚から2枚(1枚)を選ぶので、こうなります。

Post A Comment
Were you able to resolve your confusion?

Users viewing this question
are also looking at these questions 😉