Question

Tentukanlah U10 dan S10 dari 3 ,- 6, 12 ....​

Answer 1

Jawaban:

a = 3

[tex]r = \frac{u2}{u1} = \frac{ - 6}{3} = - 2[/tex]

U10

[tex]un = a {r}^{n - 1} \\ u10 = 3 \times {( - 2)}^{9} \\ u10 = 3 \times( - 512) \\ u10 = - 1536[/tex]

S10

[tex]sn = \frac{a(1 - {r}^{n} )}{1 - r} \\ s10 = \frac{3(1 - {( - 2)}^{10}) }{1 - ( - 2)} \\ s10 = \frac{ 3(1 - 1024) }{3} \\ s10 = - 1023[/tex]

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