To find the 19th term of the given arithmetic progression (A.P.) where the sum of the first n terms is given by
解析 D In the sequence 54, 18, 6, …, each term after the first is being multiplied by 13. If a_n represents the nth term of the sequence, then a_n=54(13)^(n-1). The exponent is n-1 rather than n since for n=1, a_1 must be equal to 54.反馈 收藏 ...
If the ratio of sum of m terms of an AP to the sum of n terms of the same AP is m^2/n^2. Then prove that the ratio of its mth and nth terms is 2m-1 : 2n-1.
For a seque nce,ifSn=5(4^n-1) , find the nth term, hence verify that it is a G.P., Also find r. 相关知识点: 试题来源: 解析 (1-ut) SI = "1. ()(-u)s= (I -)(1-ut)S = (-ut-ut)s= S+(_(1-u)')S-S-(uv)S= (I -1-ut)s-(I-ut)s= [-u LL LL S -"...
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If the sum of n terms of an A.P. is Sn=3n2+5n . Write its common difference. View Solution If Sn the sum of first n terms of an AP is given by 2n2+n, then find its nth term. View Solution The sum of first n terms of an A.P. is 5n−n2 . Find the nth term of thi...
The 7th term of an AP is -1 and its 16th term is 17. The nth term of the AP is A(3n +8) B(4n -7) C(15-2n) D(2n-15)Submit The sum of 5th and 9th terms of AP is 30. If its 25th term is three times it 8th term, find the AP. View Solution If the 8th term of ...
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