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Sequences And Series Free Doubts and Solutions

CBSE - XI Science - Mathematics - Sequences and Series

Kindly answer.

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Asked by Kchawla94 3rd March 2019, 9:15 PM
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CBSE - XI Science - Mathematics - Sequences and Series

20th sum

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Asked by lovemaan5500 15th June 2018, 6:57 AM
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CBSE - XI Science - Mathematics - Sequences and Series

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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CBSE - XI Science - Mathematics - Sequences and Series

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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CBSE - XI Science - Mathematics - Sequences and Series

Q

Asked by araima2001 3rd September 2016, 8:04 AM
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CBSE - XI Science - Mathematics - Sequences and Series

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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CBSE - XI Science - Mathematics - Sequences and Series

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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CBSE - XI Science - Mathematics - Sequences and Series

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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CBSE - XI Science - Mathematics - Sequences and Series

i f space t h e space c o m m o n space r a t i o space o f space a space G P space w i t h space a space s u m space t o space infinity space i s space x squared space minus space x minus 1 comma space w i t h i n space w h a t space l i m i t space m u s t space x space l i e ?

Asked by Olivia Adhikary 19th August 2014, 11:33 AM
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CBSE - XI Science - Mathematics - Sequences and Series

I f space A equals left parenthesis 1 space plus space r to the power of a space plus space r to the power of 2 a end exponent space plus...... infinity right parenthesis space a n d space B equals left parenthesis 1 space plus space r to the power of b space plus space r to the power of 2 b end exponent space plus....... infinity right parenthesis comma t h e n space p r o v e space t h a t : r equals open parentheses fraction numerator A minus 1 over denominator A end fraction close parentheses to the power of 1 over a end exponent space equals space open parentheses fraction numerator B minus 1 over denominator B end fraction close parentheses to the power of 1 over b end exponent

Asked by Olivia Adhikary 19th August 2014, 11:26 AM
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