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Verified answer
Mapel : MatematikaKelas : IX SMP
Bab : Barisan dan deret
Pembahasan :
Pola Barisan Segitiga
Un = 1/2n(n +1)
153 = 1/2n(n + 1)
306 = n(n + 1)
n² + n - 306 = 0
(n - 17)(n + 18) = 0
n = 17