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Important Concepts and Formulas - Sequence and Series

 



Comments(28)


vivek 11 Oct 2014 11:42 AM
what is answer for this question
 if the 9th term ap is zero then t29/t19=k. where k=?
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Raj 16 Oct 2014 10:23 PM
9th term = 0
a + (9-1)d = 0
a + 8d = 0
a = -8d

k = [a + (29-1)d] / [a + (19-1)d] = (-8d+ 28d) / (-8d + 18d) = 20d/10d = 2
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Anirudh Mishra 16 Oct 2014 10:16 PM
VIVEK, answer for your question is 2
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seenu 06 Sep 2014 7:40 PM
i like maths and i love maths
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Harshit 04 Sep 2014 1:01 PM
How to you find the sum of a series if the difference of terms of the series are in ap.
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anirudh 30 Sep 2014 11:19 PM
if common  difference is in A.P. eg:1  2  4  7  11  16 ..... nterms.

S= 1 + 2 + 4 + 7 + 11 + .......... +T

S =          1 + 2 +  4   +   7  + ...............+Tn-1 + TN

SUBTRACT :

0= 1- ( 1 + 2+ 3+ 4+ ........ N-1 TERM) - Tn term


Tn =1+ n(n-1)/2

NOW FIND Sn .
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somesh chandra 07 Jul 2014 5:28 PM

Q. find the ans srise

0,8,54,192,500,?

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Jay 10 Jul 2014 12:10 AM
The pattern is n4 - n3

it goes as 0, 8, 54, 192, 500, 1080, 2058
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vinita 23 May 2014 3:40 PM
i like it
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priya 04 Apr 2014 7:52 PM
the sum of first 'n' terms of the series 1/2+3/4+7/8+15/16+......
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