Jawaban:
a. Tentukan nilai n!
Un : 167
a : 7
b : 8
Un = a + (n-1)b
167 = 7 + (n-1)8
167 = 7 + 8n - 8
167 = 8n - 1
168 = 8n
n = 21
b. Jumlah 32 suku pertama!
[tex]s = \frac{n}{2} (2a + (n - 1)b)[/tex]
[tex]s = \frac{32}{2} (2.7 + (32 - 1)8)[/tex]
[tex]s = 16(14 + 31.8)[/tex]
[tex]s = 16(14 + 243) = 16 \times 257[/tex]
[tex]s = 4112[/tex]
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Jawaban:
a. Tentukan nilai n!
Un : 167
a : 7
b : 8
Un = a + (n-1)b
167 = 7 + (n-1)8
167 = 7 + 8n - 8
167 = 8n - 1
168 = 8n
n = 21
b. Jumlah 32 suku pertama!
[tex]s = \frac{n}{2} (2a + (n - 1)b)[/tex]
[tex]s = \frac{32}{2} (2.7 + (32 - 1)8)[/tex]
[tex]s = 16(14 + 31.8)[/tex]
[tex]s = 16(14 + 243) = 16 \times 257[/tex]
[tex]s = 4112[/tex]
Semoga membantu✨