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u3 = a + 2b = 9 -
3b =243
b = 78
a + 2b = 9
a + 2x78 = 9
a + 156 =9
a= -147
S5 = 1/2n ( 2a + (n-1)b
= 1/2 x 5 (2x-147 + ( 5-1)78
=2,5 ( -294 + 312)
= 2,5(18)
= 45