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Verified answer
Mapel = MatematikaBab = Barisan dan Deret
Materi = Deret Aritmetika
Diketahui :
U1 = 3
Un = 147
Beda = 3
Penyelesaian :
Un = a + (n - 1)b
147 = 3 + (n - 1)3
147 = 3 - 3 + 3n
147 = 3n
n = 147 / 3
n = 49
Sn = n/2 (a + Un)
S49 = 49/2 (3 + 147)
S49 = 49/2 (150)
S49 = 3675
Semoga Membantu :)
Verified answer
Deret Aritmatikaa = 3
b = 3
Un = 150 - 3
= 147
Penyelesaian
Un = a + (n-1)b
147 = 3 + (n-1)3
147 = 3 + 3n - 3
147 = 3n
n = 147 / 3
n = 49
Sn = n/2 (2a + (n-1) b )
S49 = 49/2 ( 2(3) + (49 - 1 )3)
= 49/2 ( 6 + 48.3 )
= 49/2 ( 6 + 144)
= 49/2 ( 150 )
= 7350/2
= 3675