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a + b = 11
U3 + U4 = 31
a + 2b + a + 3b = 31
2a + 5b = 31
2a + 5b = 31 / a + b = 11 (dikali 2) (eleminasi)
2a + 5b = 31 / 2a + 2b = 22
b = 3
2a + 2 (3) = 22
a = 8
Sn = n/2 (2a + (n-1) b)
= 5 (2(8) + 9(3))
= 5 (16+27)
= 215