[a]1. The problem statement, all variables and given/known data[/b] Evaluate: 12 [tex]\sum[/tex] (6n + 1) n=5 2. The attempt at the solution So, how do i go about doing this? I tried finding the first three numbers of the series to find the difference by substituting n = 5,6,7 and then use the Sum formula S = n/2[2a + (n-1)d]. But the answer turned out to be wrong. The correct answer to this is 416.