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Verified answer
Bab Barisan dan DeretMatematika SMP Kelas VIII
1] Un = 3n - 2
b = U2 - U1
= (3 x 2 - 2) -(3 x 1 - 2)
= 4 - 1
= 3
2] b = (U9 - U5)/(9 - 5)
= (20 - 8)/4
= 12/4
= 3