anonymous
  • anonymous
Given the first and last terms, find the sum of the series.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
its a little 8. Sorry lol
anonymous
  • anonymous
|dw:1333327847851:dw|
lgbasallote
  • lgbasallote
this is what...arithmetic progression? or geometric?

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anonymous
  • anonymous
arithmetic
lgbasallote
  • lgbasallote
i am assuming a= 11 means that it's the first term and t_8 = 102 means it's the last yes?
anonymous
  • anonymous
I suppose
lgbasallote
  • lgbasallote
hmmm well the sum is.. S_n = n(a_1 + a_n)/2 so..identify your given: n = ? a_1 = ? a_n = ? what do you think? :D
anonymous
  • anonymous
Can you walk me through this? please
anonymous
  • anonymous
n=1?
lgbasallote
  • lgbasallote
no.. notice A_n..what is A_n?
anonymous
  • anonymous
11-1?
lgbasallote
  • lgbasallote
hmmmm..it would probably be better if i explained the terms.. A_1 is the first term in the sequeence A_n is a certain number in the sequence n is where A_n is (like if it's the twentieth number of the sequence or something) so now...identify the values of these variables
anonymous
  • anonymous
A_1 = 11 i dont know

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