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S11 = 11/2(2a + (11 - 1)b)
= 11/2(2a + 10b)
= 11(a + 5b)
= 11a + 55b
= 11(30) + 55b
= 330 + 55b
330 + 55b = 110
55b = 110 - 330
55b = -220
b = -220/55
b = -4
---> B.