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• CBSE×
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• Sequences And Series×

# Sequences And Series Free Doubts and Solutions

### CBSE - XI Science - Mathematics - Sequences and Series

Asked by Kchawla94 3rd March 2019, 9:15 PM

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## 20th sum

Asked by lovemaan5500 15th June 2018, 6:57 AM

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## If S be the sum of (2n+1) terms of an AP and S1 that of alternate terms beginning with the first ,then show that S/S1 =2n+1/n+1

Asked by nk.pandit02 13th March 2017, 7:03 PM

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## why we have use log in this question: 1+3+9+27+.....n terms>7000.Find n?Is there any other way to solve this without using log?

Asked by Sugandha 23rd December 2016, 10:17 AM

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## Q

Asked by araima2001 3rd September 2016, 8:04 AM

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## why we have taken these numbers as 13,16,19,22,25. Why not 11.5,14.5,17.5,20.5,23.5,26.5

Asked by aashu.60 3rd September 2015, 6:51 AM

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## Let x=1+a+a^2+.... and y=1+b+b^2+..... , where  |a|<1 and |b|<1. Prove that  1+ab+a^2b^2+......=xy/(x+y-1)

Asked by Vineeth K 21st March 2015, 8:23 PM

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## Let a,b,c be respectively the sum of the first terms , the next n terms of a G.P .Show that a, b , c are in G.P.

Asked by Vineeth K 22nd February 2015, 8:43 AM

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