Math Problem Statement

Terdapat kartu: 1, 2, 3, 4, 5, 6, 7, 8, 9. Dari sembilan kartu tersebut dipilih tiga kartu. Banyak pilihan yang mungkin sehingga kartu yang terpilih berjumlah 15 adalah...

Solution

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Math Problem Analysis

Mathematical Concepts

Combinatorics
Summation
Basic Arithmetic

Formulas

Sum of selected cards = 15
Combination formula: C(n, r) = n! / (r! * (n - r)!)

Theorems

Basic combination theorem
Addition principles in combinatorics

Suitable Grade Level

Grades 6-8