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Bab Barisan dan DeretMatematika SMP Kelas VIII
2 . U2 = U1 + U3
2 . n = 5 + 19 - n
2n + n = 24
3n = 24
n = 24 : 3
n = 8
b = U2 - U1
= n - 5
= 8 - 5
= 3
U10 = a + 9b
= 5 + 9 . 3
= 5 + 27
= 32