百度试题 结果1 题目Find the sum of the arithmetic sequence.∑_(i=1)^∑(2i-3) 相关知识点: 试题来源: 解析 =3601a_1=2(1)-3=-1 a_(20)=2(20)-3=37 20 反馈 收藏
The sum, s, of the arithmetic series a1+a2+⋯+an is given by the formula s=n(a1+an2) where n is the number of terms, a1 is the first term of the series, and an is last term of the series. Answer and Explanation: Let's expand the given series. {eq}\begin{align...
百度试题 结果1 题目Which one of the following formulas is used to find the sum of n terms of an arithmetic series?A. B. C. D. 相关知识点: 试题来源: 解析 C 反馈 收藏
This is theformulato find thesumof the firstnntermsof thesequence. Toevaluateit, the values of the first andnnthtermsmust be found. Sn=n2⋅(a1+an)Sn=n2⋅(a1+an) This is anarithmetic sequencesince there is a commondifferencebetween eachterm. In this case, adding22to the previoustermi...
Find the sum of the first 20 terms of the arithmetic sequence where the first term is 3 and the common difference is 4. A. 780 B. 790 C. 800 D. 810 相关知识点: 试题来源: 解析 C。解析:使用等差数列求和公式 Sn = n(a1 + an)/2,先求出第 20 项为 79,再计算可得和为 800。
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Sum the series :x(x+y)+x2(x2+y2)+x3(x3+y3+→nterms. View Solution Find the sum of the following arithmetic progression:x−yx+y,3x−2yx+y,5x−3yx+y,..−−→nterms. View Solution Write down the terms of the expression:8x4y−7x3yz+43x2yz2−5xyz. ...
According to the problem, we have a series given as 1, 3, 5, 7, 9,……. We need to find the sum of the elements in this series up to n terms.We know that an Arithmetic Progression (AP) is of form a, a+d, a+2d,…….., where ‘a’ is kno...
4 The sum of the first n terms of an arithmetic series is 2n(n +3)Find(a) the first term of the series,2 ×4=8(1)(b)the common difference of the series,S_2=2a+d=4*5(3)d=4(c) the 25th term of the series.(2)25th term=a+24d=8+24 × 4=104 ...
An infinite series is the sum of terms in an infinitely long sequence, but taking the sum of terms in a finite portion of the sequence is called a partial sum. Explore these two concepts through examples of five types of series: arithmetic, geometric, harmonic, alte...