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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
b = U2 - U1
b = 7 - 2
b = 5
Un = a + (n - 1) b
U(n + 1) = 2 + (n + 1 - 1) . 5
U(n + 1) = 2 + 5n
U(n + 1) = 5n + 2