1.

If \[\sum\limits_{i=1}^{n}{i=\frac{n(n+1)}{2}}\], then  \[\sum\limits_{i=1}^{n}{(3i-2)=}\]

A.   \[\frac{n(3n-1)}{2}\]
B.   \[\frac{n(3n+1)}{2}\]
C. \[n(3n+2)\]
D. \[\frac{n(3n+1)}{4}\]
Answer» B.   \[\frac{n(3n+1)}{2}\]


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