The sequence of numbers $$C_{1},C_{2},C_{3},...C_{n}...$$ is defined by $$C_{1}=2,C_{2}=4$$ and $$C_{n}=C_{n-1}+n$$ for each integer n greater than 2. What is the value of $$C_{6}$$ ?
The sequence of numbers $$C_{1},C_{2},C_{3},...C_{n}...$$ is defined by $$C_{1}=2,C_{2}=4$$ and $$C_{n}=C_{n-1}+n$$ for each integer n greater than 2. What is the value of $$C_{6}$$ ?