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单词 arithmetic series
释义 arithmetic series(arithmetic progression)
A series or progression of numbers in which there is a common difference between terms, e.g. 3, 9, 15, 21,… is an arithmetic series with a common difference of 6. The general formula for the nth term is
[a+(n - 1)d]
and the sum of n terms is
n[2a+ (n - 1)d]/2.
Compare geometric series
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