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 。
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...
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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...
prime number & composite number 质数与合数* A prime number is a positi 4、ve integer that has exactly two different positive divisors,1 and itself.* A composite number is a positive integer greater than 1 that has more than two divisors.* The numbers 1 is neither prime nor composite, 2 ...
32. Systems with high sand supply tend to produce dunes that grow taller when flux is not unidirectional (Fig.4a), following intuition. Unidirectional dunes exhibit sub-linear scaling of height with wavelength indicating a decrease in aspect ratio as dunes grow. Star and linear dunes, by ...
What is the interest-free internal rate of return? What is the times interest earned ratio? At an interest rate of 15% per year, an investment of $100,000 one year ago is equivalent to how much now? Is a yield an annual percentage rate? You invest $1,000 in a junk bond that pays...
Continuous data can be further divided into two types, namely, ratio data and interval data. Statistically, the geometric or harmonic mean is calculated in ratio data while the arithmetic mean is calculated in interval data. A few examples of continuous data include: ...
TheGartley patternis the most common harmonic chart pattern. Harmonic patterns operate on the premise that Fibonacci sequences can be used to build geometric structures, such asbreakoutsandretracements, in prices. The Fibonacci ratio is common in nature and has become a popular area of focus among...
Some of the most striking examples of mathematical patterns are in Islamic art and design. An aversion to depicting humans and animals led to a rich history of intricate tile arrangements and geometric forms. 数学模式最引人注目的一些例子在伊斯兰艺术和设计里见得到,其对描绘人类和动物的禁忌引领出错...