Sn = the sum of the initial n terms of arithmetic sequence, a = the first term, d = the common difference between the terms, n = the total number of terms in the sequence and an = the last term of the sequence.Formula 2: The sum of the first n terms of the arithmetic sequence ...
Sn=(n+1)(a1+an)/2 D. Sn=(n-1)(a1+an)/2 相关知识点: 试题来源: 解析 A。本题考查等差数列求和公式。选项 A 中 Sn 表示前 n 项和,n 是项数,a1 是首项,an 是末项。除以 2 是因为求和时首尾相加乘以项数再除以 2。选项 B 不是等差数列求和公式,选项 C 和 D 也不正确。反馈 收藏 ...
Arithmetic Sequences are sometimes called Arithmetic Progressions (A.P.’s)Advanced Topic: Summing an Arithmetic SeriesTo sum up the terms of this arithmetic sequence:a + (a+d) + (a+2d) + (a+3d) + ... use this formula:What is that funny symbol? It is called Sigma Notation Σ (...
Learn to define what an arithmetic sequence is and discover the arithmetic sequence formula. Learn to find the nth term and sum of arithmetic...
ItsMyAcademy.com For Free Complete Video Tutorial on Sequence & Series. To find the n terms of an Arithmetic Series- Arithmetic Sequences- Arithmetic Progression in this problem we use following formula Sum (S) = n(a+l)/2. In abo...
Sum of Finite Terms of an Arithmetic Sequence Lesson Summary FAQs Activities How do you write a recursive formula for a sequence? When we are given the first term a_1 of an arithmetic sequence, the recursive formula is given by a_n = a_(n-1) + d. What is the formula used for ...
The formula for the sum of an arithmetic sequence is S = n(a₁ + aₙ)/2. What does n represent? A. The number of terms in the sequence. B. The common difference. C. The first term. D. The last term. 相关知识点:
The formula for the sum of an arithmetic sequence is S = n(a₁ + an)/2 (where n is the number of terms, a₁ is the first term and an is the nth term). If n = 10, a₁ = 2 and an = 18, what is the value of S?
A. \(na_1\) B. \(\frac{n}{2}(a_1 + a_n)\) C. \(n(a_1 + a_n)\) D. \(\frac{n}{2}a_1\) 相关知识点: 试题来源: 解析 B。中文解析:文章中给出等差数列前\(n\)项和公式为\(S_n=\frac{n}{2}(a_1 + a_n)\)。反馈 收藏 ...
An arithmetic series is the sum of the terms in an arithmetic sequence with a definite number of terms. Following is a simple formula for finding the sum: