结果1 题目In the sequence 2, 6, 18, 54,..., what is the common ratio? A. 2 B. 3 C. 4 D. 5 相关知识点: 试题来源: 解析 B。解析:这个数列是等比数列,后一项与前一项的比值是定值,6÷2=3,18÷6=3,54÷18=3。反馈 收藏
The sum of an infinite geometric sequence is 12 and the first term is 3. What is the common ratio? A. 1/4 B. 1/3 C. 1/2 D. 2/3 相关知识点: 试题来源: 解析 C。根据无穷等比数列求和公式 S = a1 / (1 - q) ,可得 12 = 3 / (1 - q) ,解得 q = 1/2 。A 选项 1/4...
In a geometric sequence, the first term is 2 and the common ratio is 3. What is the 4th term? A. 18 B. 54 C. 16 D. 32 相关知识点: 试题来源: 解析 B。等比数列通项公式为 an = a1×r^(n - 1) ,将 a1 = 2,r = 3,n = 4 代入,可得 a4 = 2×3^(4 - 1) = 54 。
10、 连续数例 1:In an increasing sequence of 10 consecutive integers, the sum of the first 5 integers is 560. What is the sum of the last 5 integers in the sequence?(A) 585 (B) 580 (C )575 (D)570 (E) 565例 2:If n is an integer greater than 6, which of the following mus...
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In short, all machine learning is AI, but not all AI is machine learning. Key Takeaways Machine learning is a subset of AI. The four most common types of machine learning are supervised, unsupervised, semi-supervised, and reinforced.
In short, all machine learning is AI, but not all AI is machine learning. Key Takeaways Machine learning is a subset of AI. The four most common types of machine learning are supervised, unsupervised, semi-supervised, and reinforced.
What Is the Harmonic Mean? The harmonic mean is a numerical average used in finance to average multiples like the price-to-earnings ratio. It is calculated by dividing the number of observations, or entries in the series, by the reciprocal of each number. Thus, the harmonic mean is the re...
Abstractions are a common element of everyday life and language. For example, “π” allows us to represent the ratio of the length of a circle’s circumference to that of its diameter without having to write out its infinite digits. Similarly, a thermostat allows us to control the temperatu...
and the sequence continues infinitely. One of the remarkable characteristics of this numerical sequence is that each number is approximately 1.618 times greater than the preceding number. This common relationship between every number in the series is the foundation of the ratios used by technical trade...