Sequences and Series (002)

骂我的全数奉还2022-10-04 11:39:540条回答

Sequences and Series (002)
The possitive numbers a, b and c are consecutive terms in a geometric progression; express b in terms of a and b. Deduce that lga, lgb, and lgc are consecutive terms in an arithmetic progression.

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二语习得的顺序
How many different 6-letter sequences are there that consist
How many different 6-letter sequences are there that consist of 1 A,2 B’s,and 3 C’s
A.6
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6!/2!/3!=60
就是六个全排列去掉两个完全一样的B的排列、三个完全一样的C的排列
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from infected birds,but in none from the uninfected bird.
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GN18 sequences是什么?
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(1)We will call a sequence an arithmetic sequence if there is a common difference
意思是我们称一个有相等差别的数列为算术数列,其实说白了就是我们的等差数列
如1,3,5,7,9.
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意思是:"几何数列就是数字间是同等比例的顺序"
说白了就是我们常说的等比数列
如:3,6,12,24,48...
就是3*2^(n-1)
参考资料里非常详细,不过是英文版的,有不明白的请来信息