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CBSE Class 11-science Answered

5th sum
question image
Asked by lovemaan5500 | 21 Jun, 2018, 06:56: AM
answered-by-expert Expert Answer
begin mathsize 16px style 2 squared plus 5 squared plus 8 squared plus......
open parentheses 3 straight n minus 1 close parentheses squared........... straight n equals 1 space to space 15
sum from straight n equals 1 to 15 of open parentheses 3 straight n minus 1 close parentheses squared
equals sum from straight n equals 1 to 15 of open parentheses 9 straight n squared minus 6 straight n plus 1 close parentheses
equals sum from straight n equals 1 to 15 of 9 straight n squared minus sum from straight n equals 1 to 15 of 6 straight n plus sum from straight n equals 1 to 15 of 1
equals 9 fraction numerator 15 open parentheses 15 plus 1 close parentheses open parentheses 30 plus 1 close parentheses over denominator 6 end fraction minus fraction numerator 15 open parentheses 15 plus 1 close parentheses over denominator 2 end fraction plus 15 end style
Answered by Arun | 21 Jun, 2018, 12:08: PM

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