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Verified answer
Mapel = MatematikaKelas = 9 SMP
Bab = Barisan dan Deret
Diketahui:
U3 = 11
U6 = 20
Beda = (U6 - U3) / (6-3)
Beda = (20 - 11) / 3
Beda = 9/3
Beda = 3
Un = a + (n-1)b
U3 = a + (3-1)3
11 = a + 6
-a = 6-11
-a = -5
a = 5
Sn = n/2 (2a + (n-1)b )
S16 = 16/2 (2 . 5 + (16-1)3)
S16 = 8 (10 + 45)
S16 = 8 (55)
S16 = 440
Semoga membantu :)