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A core property of the arithmetic progression is the same difference.
而等差分拆是一种有限制条件的分拆.
期刊摘选
Prove that no four consecutive binomial coefficients can be in arithmetic progression.
证明不存在四个连续的二项系数成算术级数.
辞典例句
"1-4-7-10-13- is the start of an arithmetic progression"
等差数列???
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