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187 = 11/2 (2a + (11-1)b)
187 = 11/2 (2a+10b)
374 = 22a + 110b
374 = 22(a+b)
a + b = 17
a = 17-b
187 = 11/2 (2(17-b) +(11-1)b
maka
b = 0
beda baru = 0 / 2 + 1 = 0 / 3 = 0
jadi jumlah deret baru sama saja yaitu 187