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CBSE Class 11-science Answered

Could you please give the solution to problem number 20.

 

Asked by shaikh.farid25 | 05 Nov, 2018, 07:03: PM
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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