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CBSE Class 10 Answered

1,if the sum of first 7 terms of and AP is 49 and that of 17 terms is 289 find the sumod first n terms 2,Find the sum of odd numbers between 0 and 50 3, An AP consists of 25 terms if 13th Term is 50 find the sum of all the terms in AP 4,Find the sum of Integers between 100 and 200 and that are Divisible by 9 not Divisible by 9  
Asked by harinimathi815 | 22 Feb, 2022, 07:38: PM
answered-by-expert Expert Answer
straight S subscript 7 equals 7 over 2 open parentheses 2 straight a plus 6 straight d close parentheses
49 equals 7 over 2 open parentheses 2 straight a plus 6 straight d close parentheses
straight a equals 7 minus 3 straight d... open parentheses 1 close parentheses

straight S subscript 17 equals 17 over 2 open parentheses 2 straight a plus 16 straight d close parentheses
289 equals 17 over 2 open parentheses 2 straight a plus 16 straight d close parentheses
straight a equals 17 minus 8 straight d... open parentheses 2 close parentheses

solving space 1 space and space 2 space we space get
straight a equals space 1
straight d equals 2

hence
straight S subscript straight n equals straight n squared
Answered by Arun | 23 Feb, 2022, 09:49: AM
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