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S12 = 12^2+5/2(12)
= 144+5(6)
= 144+30
= 174
S11 = 11^2+5/2(11)
= 121+55/2
= 242/2+55/2
= 297/2
U12 = S12-S11
= 174-297/2
= 348/2-297/2
= 51/2
jadi, suku ke 12 barisan tersebut adalah