A music store bought a CD set at a cost of $20. When the store sold the CD set, the percent markup was 40%. Find the selling
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The first odd number is 1. The next is 2 more than the previous one.
It's an arithmetic sequence.
The general term of an arithmetic sequence:
a_n - n-th term
a_1 - first term
d - common difference.
We have
Substitute: