If `.^(n)C_(9)=.^(n)C_(7)`, find n.

Explanation

To solve the problem where \( \binom{n}{9} = \binom{n}{7} \), we can follow these steps:

### Step 1: Write the formula for combinations
The formula for combinations is given by:
\[ \binom{n}{r} = \frac{n!}{r!(n-r)!} \]
Thus, we can express \( \binom{n}{9} \) and \( \binom{n}{7} \) using this formula.
...