Question
Find each sum.$$7+12+17+\cdots+(2+5 n)$$
Step 1
The given sequence is \(7, 12, 17, \ldots, (2 + 5n)\). This is an arithmetic sequence where the first term \(a_1 = 7\) and the common difference \(d\) can be found by subtracting the first term from the second term: \[ d = 12 - 7 = 5. \] Show more…
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