superhelp101
  • superhelp101
what is the sum of first 150 terms in sequence of..
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
superhelp101
  • superhelp101
|dw:1432790538670:dw|
superhelp101
  • superhelp101
a) 61200 b)90000 c)122400 d)180000
Nnesha
  • Nnesha
it's arithmetic seq so formula is \[\huge\rm s_n = (\frac{ a_1 +a_n }{ 2 })\] a_n = last term

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More answers

superhelp101
  • superhelp101
how do i find the last term?
rational
  • rational
you may use \(n\)th term formula \[\large a_n = a_1 + (n-1)d\]
Nnesha
  • Nnesha
plug in 150 for n
superhelp101
  • superhelp101
a sub 149 -8
rational
  • rational
|dw:1432791026176:dw|
Nnesha
  • Nnesha
correction \[\huge\rm s_n =\color{red}{n} (\frac{ a_1 +a_n }{ 2 })\] a_n = last term
superhelp101
  • superhelp101
so |dw:1432791117579:dw|
rational
  • rational
Yes, find \(a_n\) and plug it in
superhelp101
  • superhelp101
still don't know how
superhelp101
  • superhelp101
wait..
rational
  • rational
http://gyazo.com/ca2bdcbc0726ce40658353f8868be9f6
superhelp101
  • superhelp101
a sub n is -192
superhelp101
  • superhelp101
so would it be A?
rational
  • rational
\[a_{150} = 1000+(150-1)(-8) = -192\]
rational
  • rational
then the sum is \[S_{150} = \frac{150(1000-192)}{2} =606000 \]
superhelp101
  • superhelp101
oh ! i don't know :/
superhelp101
  • superhelp101
how would u do it?
rational
  • rational
we're done!
rational
  • rational
606000 is the sum of first 150 terms it seems the options are wrong
superhelp101
  • superhelp101
a) 61200 b)90000 c)122400 d)180000 these are the answer choices ?
superhelp101
  • superhelp101
it might been a typo
Nnesha
  • Nnesha
take a screenshot o^_^o
superhelp101
  • superhelp101
it ok, but thxx for all the help :D

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