Math Problem Statement
1から10までのカードが3枚ずつある。この中から合計7となるようなカードの引き方は何通りあるか。カードは何枚引いても良く、引いたカードは元に戻さない。
Solution
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Math Problem Analysis
Mathematical Concepts
Combinatorics
Permutations
Formulas
Permutations formula nPr = n! / (n - r)!
Theorems
-
Suitable Grade Level
High School
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