Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

16 2nd part
question image
Asked by lovemaan5500 | 17 Jul, 2018, 06:36: PM
answered-by-expert Expert Answer
begin mathsize 16px style straight S subscript straight n equals straight n over 2 open square brackets 2 straight a plus left parenthesis straight n minus 1 right parenthesis straight d close square brackets 6 equals 3 over 2 open parentheses 2 straight a plus 2 straight d close parentheses 6 equals 3 straight a plus 3 straight d..... left parenthesis straight i right parenthesis straight S subscript 6 equals 6 over 2 open parentheses 2 straight a plus 5 straight d close parentheses 3 equals 6 straight a plus 15 straight d........ left parenthesis ii right parenthesis Solving space left parenthesis straight i right parenthesis space and space left parenthesis ii right parenthesis we space get space straight a space equals space 3 space and space straight d equals negative 1 2 open parentheses 2 straight n plus 1 close parentheses straight S subscript straight n plus 4 end subscript equals 2 open parentheses 2 straight n plus 1 close parentheses fraction numerator straight n plus 4 over denominator 2 open square brackets 2 straight a plus open parentheses straight n plus 3 right parenthesis straight d close parentheses close square brackets end fraction equals left parenthesis 2 straight n plus 1 right parenthesis left parenthesis straight n plus 4 right parenthesis left parenthesis 3 minus straight n right parenthesis Solving space RHS space we space get space left parenthesis straight n plus 4 right parenthesis straight S subscript 2 straight n plus 1 end subscript equals left parenthesis 2 straight n plus 1 right parenthesis left parenthesis straight n plus 4 right parenthesis left parenthesis 3 minus straight n right parenthesis Hence comma 2 open parentheses 2 straight n plus 1 close parentheses straight S subscript straight n plus 4 end subscript equals left parenthesis straight n plus 4 right parenthesis straight S subscript 2 straight n plus 1 end subscript end style
Answered by Sneha shidid | 19 Jul, 2018, 10:06: AM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 11-science - Maths
please solve number 7
question image
Asked by sanjuktamukherjee165 | 24 Oct, 2021, 11:04: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
if a²,b²,c² are in ap then prove that .. 1/b+c ,1/c+a,1/a+b
Asked by Vibhorjarora798 | 21 Aug, 2021, 05:43: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
1/3 ,1/5, 1/7, 1/9 verify whether the following sequence are hp
Asked by hirugadeshravani | 26 Dec, 2020, 07:37: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
5+11+19+29+41+....
question image
Asked by pavanindr | 09 Feb, 2020, 04:56: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
7th sum
question image
Asked by lovemaan5500 | 02 Feb, 2019, 08:26: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
23rd sum  
question image
Asked by lovemaan5500 | 28 Jan, 2019, 06:33: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
26th sum
question image
Asked by lovemaan5500 | 28 Jan, 2019, 06:32: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
14th sum.plz
question image
Asked by lovemaan5500 | 28 Jan, 2019, 06:29: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Could you please give the solution to problem number 20.  
question image
Asked by shaikh.farid25 | 05 Nov, 2018, 07:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
4 i part
question image
Asked by lovemaan5500 | 17 Jul, 2018, 06:39: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×