" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
Mapel : MatematikaMateri : Barisan dan Deret
Kelas : 9
a = 8
b = 14 - 8 = 6
Un = 428
⇔b] Banyak Suku
Un = 428
a + (n - 1)b = 428
8 + (n - 1)(6) = 428
8 + 6n - 6 = 428
6n = 428 - 2
6n = 426
n = 426/6
n = 71
⇔a] Suku Tengah
Ut = (a + Un) /2
Ut = (8 + 428)/2
Ut = (436)/2
Ut = 218
⇔c] Suku ke tengah
Ut = 218
a + (n - 1)b = 218
8 + (n - 1)(6) = 218
6n = 218 - 2
6n = 216
n = 216/6
n = 36
→ Suku ke - 36 barisan