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CBSE Class 10 Answered

Q2 Please answer the question in short cut but fundementally and step wize . I hardly able to understand your answer .  
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Asked by sucharitasahoo1 | 22 Mar, 2018, 09:01: PM
answered-by-expert Expert Answer
begin mathsize 16px style 2 plus 5 plus 8 plus 11 plus..... straight a equals 2 comma space straight d equals 3 comma space straight S subscript straight n space greater or equal than space 610 Here comma space we space assume space that space straight S subscript straight n equals 610. straight n over 2 open square brackets 2 straight a plus open parentheses straight n minus 1 close parentheses straight d close square brackets equals straight S subscript straight n straight n over 2 open square brackets 2 cross times 2 plus open parentheses straight n minus 1 close parentheses cross times 3 close square brackets equals 610 straight n open parentheses 4 plus 3 straight n minus 3 close parentheses equals 610 cross times 2 straight n open parentheses 1 plus 3 straight n close parentheses equals 1220 straight n plus 3 straight n squared equals 1220 3 straight n squared plus straight n minus 1220 equals 0 3 straight n squared plus 61 straight n minus 60 straight n minus 1220 equals 0 straight n left parenthesis 3 straight n plus 61 right parenthesis minus 20 left parenthesis 3 straight n plus 61 right parenthesis equals 0 open parentheses 3 straight n plus 61 close parentheses open parentheses straight n minus 20 close parentheses equals 0 straight n not equal to fraction numerator negative 61 over denominator 3 end fraction Hence comma space straight n equals 20. The space least space value space of space straight n space such space that space sum space of space the space given space straight n space terms space of space the space series is space greater space than space or space equal space to space 610 space is space straight n equals 20. end style
Answered by Sneha shidid | 23 Mar, 2018, 09:28: AM

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CBSE 10 - Maths
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