T\ ol B Sumef 32 dams बूटी 2 अन्न कि 2et rom B =l £ पी

T\ ol B Sumef 32 dams बूटी 2 अन्न कि 2et rom B =l

1.	T\ ol B Sumef 32 dams बूटी 2 अन्न कि 2et rom B =l £ पी
Answer» Let 'a' be the first term and 'd' be the common difference.3rd term = a + (n - 1)dHere n = 3= a + 2d3rd term = 1. ............... (given)Hence,a + 2d = 1 ................ (1)Now6th term = a +5d6th term = -11. ............. (given)Hence,a + 5d = -11. ............... (2)Subtracting equations (1) from (2)a + 5d = -11- a + 2d = 1——————3d = -12d = -12/3 = -4HencePutting d = -4 in equation (1)a + 2d = 1a + 2(-4) = 1a - 8 = 1a = 9Sum formulaS(n) = n/2 [2a+ (n - 1)d]Sum of 32 terms =S(32) = 32/2 [ 29 + (32 - 1)(-4)]= 16 [ 18 + 31(-4)]= 16 ( 18 - 124)= 16 ( - 106)= - 1696