SOLUTION: Find the sum
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Algebra ->
Sequences-and-series
-> SOLUTION: Find the sum
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Log On
Since the 2nd term has no variables, we can simply multiply the inner value -5 by the number of terms 156
Multiply
Pull out the coefficient 4
Now this is where the formula comes in. There's one small problem though: the terms NEED to start at 1. So what this means is that we have to break into