8,12,16 See the sum of the first 'n' words in it
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the sum of the first `n' words in it is 4
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Sn = n/2 [ a + ( n - 1 ) d ]
= n/2 [ 8 + ( n-1 )4 ]
= n/2 ( 8 + 4n - 4 )
= n/2 ( 4 +4n)
= 2n^2 + 2n
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