Prove that \[ \left(\begin{array}{c}n\\1\end{array}\right)=n.\]

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Lesson Parent: 
The Binomial Theorem
Problem: 

Prove that \[ \left(\begin{array}{c}n\\1\end{array}\right)=n.\]

Answer: 

It is true that \[ \left(\begin{array}{c}n\\1\end{array}\right)=n.\]

SAMPLE SOLUTION

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Solution: 

Since

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and because we have solved this here we know that

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