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CBSE Class 11-science Answered

15th 
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Asked by lovemaan5500 | 12 Jul, 2018, 10:09: PM
answered-by-expert Expert Answer
begin mathsize 16px style begin inline style sum from straight r equals 0 to straight n of 3 to the power of straight r cross times straight C presuperscript straight n subscript straight r Using space binomial space expansion sum from straight r equals 0 to straight n of 3 to the power of straight r cross times straight C presuperscript straight n subscript straight r equals sum from straight r equals 0 to straight n of straight C presuperscript straight n subscript straight r cross times straight a to the power of straight n minus straight r end exponent cross times straight b to the power of straight r Comparing space both space sides comma straight a equals 1 space and space straight b equals 3 sum from straight r equals 0 to straight n of straight C presuperscript straight n subscript straight r cross times 1 to the power of straight n minus straight r end exponent cross times 3 to the power of straight r space which space is space sum from straight r equals 0 to straight n of 3 to the power of straight r cross times straight C presuperscript straight n subscript straight r Put space the space same space values space in space left parenthesis straight a plus straight b right parenthesis to the power of straight n equals left parenthesis 1 plus 3 right parenthesis to the power of straight n equals 4 to the power of straight n end style end style
Answered by Sneha shidid | 13 Jul, 2018, 11:41: AM

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CBSE 11-science - Maths
If H is the HM between p and q then h/p+h/q
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Asked by mahavenkat152004 | 25 Jul, 2020, 07:49: PM
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CBSE 11-science - Maths
1/1.3+1/2.5 +......+1/n(2n+1)
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CBSE 11-science - Maths
Sum the series to n terms  1.2.4+2.3.7+3.4.10+...
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CBSE 11-science - Maths
Sum of term: 1^3+3^3+5^3+7^3....
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CBSE 11-science - Maths
PLEASE HELP
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Asked by Apoorva | 19 Sep, 2018, 10:04: AM
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CBSE 11-science - Maths
15th 
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Asked by lovemaan5500 | 12 Jul, 2018, 10:09: PM
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CBSE 11-science - Maths
Find the sum of n terms of the series whose nth term is n2 + 2n.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Maths
Find the sum of the series 1 + (1 + 2) + (1 + 2 + 3) + … up to n terms.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Maths
Find the sum to n terms of the series
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Maths
Find the sum of the following series: 5 + 7 + 13 + 31 + 85 + …
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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