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B. G. Kedua = a + 2
B. G. Ketiga = a + 2 + 2
= a + 4
a + a + 2 + a + 4 = 177
3a + 6 = 177
3(a + 2) = 177
a + 2 = 177/3
a + 2 = 59
a = 59 - 2
= 57
a + 4 = 57 + 4
= 61