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b = 3
Sn = 1/2n (2a+(n-1)b)
S12 = 6 (-10+ 11.3)
S12 = 6 (-10 + 33)
S12 = 6. 23
S12 = 138
U2 = -2
U3 = 1
b = -2 + 5 = 3
Sn = n/2 ( 2a+(n-1)b)
= 12/2 ( -10 + 11.3 )
= 6 ( -10 + 33 )
= 6.23
= 138