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Mapel : MatematikaKelas : XI SMA
Bab : Barisan dan deret
Pembahasan :
(a + 2) , (a - 1) , (2a - 10)
2U2 = U1 + U3
2(a - 1) = (a + 2) + (2a - 10)
2a - 2 = 3a - 8
3a - 2a = -2 + 8
a = 6
(a + 2) , (a - 1), (2a - 10)
8 , 5 , 2
Jika suku tengah ditambah (-1), maka...
8 , 5 + (-1) , 2
8 , 4 , 2
Jawaban : D