what is the sum of first 150 terms in sequence of..

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what is the sum of first 150 terms in sequence of..

Mathematics
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|dw:1432790538670:dw|
a) 61200 b)90000 c)122400 d)180000
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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Other answers:

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

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