CAT 2009 : Quant problem of the day - Sequences, Series and Progressions

If sum of n terms of an AP is given by S_n = (a-1)n³+(b-2)n²+(c-3)n where a,b,c are independent of n, then find the value of T_n

1. b(2n-1)-4n+c-1
2. a(2n-1)-4n+c-b
3. a(2n-1)-4n+b-1
4. c(2n-1)-4n+a-1

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[category quant]