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Verified answer
Mapel : MatematikaKelas : IX SMP
Bab : Barisan dan deret
Pembahasan :
Pola Barisan Segitiga
Un = 1/2n(n + 1)
300 = 1/2n(n + 1)
600 = n² + n
n² + n - 600 = 0
(n - 24)(n + 25) = 0
n = 24