CBSE Class 11-science Answered

Kindly answer.

Asked by Kchawla94 | 03 Mar, 2019, 09:20: PM

Expert Answer

let space the space series space be straight a comma space straight a plus straight c comma space straight a plus 2 straight c comma space straight a plus 3 straight c....... it space is space an space AP common space difference space equals space straight c straight S subscript straight n equals straight n over 2 open parentheses 2 straight a plus open parentheses straight n minus 1 close parentheses straight c close parentheses straight S subscript straight n minus 2 end subscript equals fraction numerator straight n minus 2 over denominator 2 end fraction open parentheses 2 straight a plus open parentheses straight n minus 2 minus 1 close parentheses straight c close parentheses rightwards double arrow straight S subscript straight n minus 2 end subscript equals fraction numerator straight n minus 2 over denominator 2 end fraction open parentheses 2 straight a plus open parentheses straight n minus 3 close parentheses straight c close parentheses straight S subscript straight n plus 2 end subscript equals fraction numerator straight n plus 2 over denominator 2 end fraction open parentheses 2 straight a plus open parentheses straight n plus 2 minus 1 close parentheses straight c close parentheses rightwards double arrow straight S subscript straight n plus 2 end subscript equals fraction numerator straight n plus 2 over denominator 2 end fraction open parentheses 2 straight a plus open parentheses straight n plus 1 close parentheses straight c close parentheses

Answered by Arun | 05 Mar, 2019, 09:14: AM

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