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The sequence of numbers $$C_{1},C_{2},C_{3},...C_{w}...$$ is defined by $$C_{1}=2,C_{4}=4$$and $$C_{n}=C_{n-1}+n$$ for each integer n greater than 2. What is the value of $$C_{6}$$ ?
A、12
B、17
C、18
D、22
E、24
答案：D
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