Elementary combinatorics: Arithmetic and geometric sequences
Arithmetic sequences
Write the following sum belonging to an arithmetic sequence \[7+10+13+\cdots + 49\] in sigma notation with summation index \(k\) and calculate it
| \(7+10+13+\cdots + 46+ 49 = {}\) |
| \(7+10+13+\cdots + 46+49 = {}\) |
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