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Verified answer
Kelas 12 MatematikaBab Barisan dan Deret Bilangan
a = 1
b = U2 - U1
b = 4 - 1
b = 3
Un = a + (n - 1) b
Un = 1 + (n - 1) . 3
Un = 1 + 3n - 3
Un = 3n - 2
Un = 28
3n - 2 = 28
3n = 28 + 2
n = 30/3
n = 10
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10
Σ (3n - 2)
n = 1