anonymous
  • anonymous
find the sum of 9+11+.....+79 what is Sn?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
is it the sum of series of odd nos????
anonymous
  • anonymous
I'm not sure, the problem only asks for the sum. I know that my a1=9 and difference ratio is probably 11/9 but I don't know where to go from there..
anonymous
  • anonymous
are u sure diff ratio is 11/9 ???

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anonymous
  • anonymous
or its diff 11 - 9 ?
anonymous
  • anonymous
any wayz....if its common diff is 2 then by formulae... An= A +(N-1) D we can find out the total no of terms then we will have another formulae for sum Sn= N/2(2A+(N-1)D)
anonymous
  • anonymous
oops! i was thinking of another formula! yes d=2. sorry, ok, now i know my answer is 1584 but i just need to make sure using the formula you provided. Thank you by the way :)
anonymous
  • anonymous
got it!!!!! thank you so much! :)
anonymous
  • anonymous
ur welcm dear....:)

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