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-9 = a+8b
u4= a+(n-1)b
6 =a+3b
a+8b=-9
a+3b=6
............ -
5b=-15
b=-3
a+3b=6
a+(-9)=6
a = 15
s12=1/2n (2a+(n-1)b)
=6 (2.15 +(12-1) -3
=6 (30-33)
=6. -3
=-18
-9 = a+8b
u4= a+(n-1)b
6 =a+3b
a+8b=-9
a+3b=6
............ -
5b=-15
b=-3
a+3b=6
a+(-9)=6
a = 15
s12=1/2n (2a+(n-1)b)
=6 (2.15 +(12-1) -3
=6 (30-33)
=6. -3
=-18