Question
Find each sum.$$-1+3+7+\cdots+(4 n-5)$$
Step 1
The given sequence is \(-1, 3, 7, \ldots, (4n-5)\). This is an arithmetic sequence where the first term \(a_1 = -1\) and the common difference \(d\) can be found by subtracting the first term from the second term. Show more…
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