(1)since a11=0 so a1+10d=0……(1)S14=98 so (2a1+13d)*14/2=98 so 2a1+13d=14 (2)2(1)-(2)=7d=-14 d=-2 then a1=20So that the general term of the sequence is an=22-2n(2)a1>=6a11=a1+10d>0(2a1+13d)*14/2反馈...
解析 a (aligned)S_n &=1/2 n[2 * 5+(n-1) * 4] \&=1/2 n(6+4 n) \&=n(2 n+3), ( as required )(aligned)b 77结果一 题目 The first term of an arithmetic series is 5 and the common difference is 4The nth term is and is the sum of the first n terms of this serie...
Answer and Explanation:1 The sequence given iscn=3nn!. Now, the first 4 terms of the sequence are given by n=1, n=2, n=3 and n=4, as... Learn more about this topic: Infinite Series & Partial Sums: Explanation, Examples & Types ...
that’s truly yours and put down roots. It’s easy to get too attached and make impulsive decisions, so remember that you’re also making one of the largest investments of your life, says DiBugnara. You have to be practical and never lose sight of your budget and long-term financial ...
The first term, common difference and last term of an A.P. are 12,6 and 252 respectively, Find the sum of all terms of this A.P.
Common mistakes new programmers make: Entering lower-case letters instead of capitalizingCinConsole, or the lettersWorLinWriteLine. Entering a comma instead of a period betweenConsoleandWriteLine. Forgetting to use double-quotation marks, or using single-quotation marks to surround the phraseHello World...
12a^5-18a^4-6a^3 (注,a^5=a的5次方) ———不用解答,2.simplify and state restrictions:式子比较复杂,就不写了.题目是首先让我化简,然后.我就看不懂了.3.大标题是find 小题目是the ternth term of an arithmetic sequence when its first term is 3 and the common difference is __?完全没看懂...
To find the sum of the first 40 terms of an arithmetic progression (AP) where the first term a=2 and the common difference d=4, we can use the formula for the sum of the first n terms of an AP: Sn=n2×(2a+(n−1)d) 1. Identify the given values: - First term a=2 - Co...
Coronary heart disease is highly prevalent in patients with ischemic stroke and the risk of long-term fatal CHD following the onset of clinical stroke or TIA is increased31. In addition, the follow-up study of patients with ischemic stroke showed that new-onset cardiovascular complications (e.g...
Now I need to rethink this approach because addressing some of the reports properly is a matter of general design choices, and making changes bit-by-bit is not a good long-term strategy or even a solution: it seems I might have even introduced some regression in 0.54 judging by the latest...