Answer
$12$
Work Step by Step
Formula to calculate the Binomial Coefficient is:
$\displaystyle \binom{n}{k}=\dfrac{n!}{k!(n-k)!}$
Let's see how this formula works:
$\displaystyle \binom{12}{1}=\dfrac{12!}{1!(12-1)!}=\dfrac{ 12 \cdot 11!}{11!}=12$