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CBSE Class 11-science Answered

Could you please give the solution to problem number 20.  
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Asked by shaikh.farid25 | 05 Nov, 2018, 07:03: PM
answered-by-expert Expert Answer
begin mathsize 18px style let space the space total space number space of space terms space be space 2 straight n straight T subscript 1 plus straight T subscript 3 plus straight T subscript 5 plus..... plus straight T subscript 2 straight n minus 1 end subscript equals 24............. eqn.1 straight T subscript 2 plus straight T subscript 4 plus straight T subscript 6 plus..... plus straight T subscript 2 straight n end subscript equals 30............. eqn.2 2 space minus space 1 nd space equals space 6...... left parenthesis 3 right parenthesis also straight T subscript 2 straight n end subscript equals straight T subscript 1 plus 10 1 half straight a plus open parentheses 2 straight n minus 1 close parentheses straight d equals straight a plus 21 over 2 2 nd minus straight d equals 21 over 2............ left parenthesis 4 right parenthesis solve space left parenthesis 3 right parenthesis space and left parenthesis 4 right parenthesis space simultaneously end style
Answered by Arun | 08 Nov, 2018, 10:01: AM

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