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b = 11-4 = 7
sn = 1/2n( 2a+(n-1)b
= 1/2n ( 2*-3 + (n-1)7
= 1/2n ( -6 + 7n -7)
= 1/2n ( 7n - 13)
S1 = 1/2*1 (7*1 - 13) = 1/2(-6) = -3
S2 = 1/2*2 ( 14 -13) = 1/2(1) = 1
S3 = 1/2*3 ( 7*3 -13) = 1,5 ( 8) = 12
s4 = 1/2*4 ( 7*4 -13) = 2(15) = 30
b= 7
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