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[a]1. Homework Statement [/b]

Evaluate:

12

[tex]\sum[/tex] (6n + 1)

n=5

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.

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.

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