Mathematics
Junior High
Solved
４＋7－1になる理由が分かりません💦
(解説)
異なる4個のものから重複を許して7個取る組合せの総数であるから
10.9.8
4+7-1C7=10C7=10C3=
=
=120
3.2.1
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すごいわかりやすいです！ありがとうございます🙇🏻♀️✨