Math Problem Statement
Show that $\sum_{k=0}^n \binom{k}{i} = \binom{n+1}{i+1}$ for all integers $n\geq 0$ and $i\geq 0$. Again, use a combinatorial argument, where you show that both sides count the same thing.
Solution
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Math Problem Analysis
Mathematical Concepts
Combinatorics
Binomial Coefficients
Summation
Formulas
\(\sum_{k=0}^n \binom{k}{i} = \binom{n+1}{i+1}\)
Binomial coefficient formula: \(\binom{n}{k} = \frac{n!}{k!(n-k)!}\)
Theorems
Combinatorial Identity
Pascal's Rule
Suitable Grade Level
Grades 10-12
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