![S_n = (\frac{n}{2} ) [ 2 a_1 + ( n - 1 ) d ]](/tpl/images/0462/4612/fcaea.png)
![S_9 = (\frac{9 }{2} ) [ 2(-504) + ( 9 - 1 )d ]](/tpl/images/0462/4612/b835d.png)
![S_9 = (4.5 )[ 2 (-504)+ ( 8 ) d ]](/tpl/images/0462/4612/3d9e5.png)
![S_{30} = ( \frac{30 }{2 }) [ 2 (-504) + ( 30-1)(122.5) ]](/tpl/images/0462/4612/b0b02.png)
![S_{30} =(15) [ 2 (-504) + ( 29)(122.5) ]](/tpl/images/0462/4612/2a57d.png)
![S_{30} = [ 2 (-504)(15) + ( 29)(122.5)(15) ]](/tpl/images/0462/4612/436ad.png)
![S_{30} = [ -15120 + 53287.5 ]](/tpl/images/0462/4612/dd11c.png)
The first term of an ap is - 504 while
the sum of its 9 terms is-126 find
sum of its 30 te...
Mathematics, 20.01.2020 08:31 marlesly87
The first term of an ap is - 504 while
the sum of its 9 terms is-126 find
sum of its 30 terms
Answers: 3
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