Pembahasan Soal Ujian Profesi Aktuaris
SOAL
Pilihlah pernyataan yang benar di bawah ini yang menggambarkan hubungan antara Sn| dan an| :
- \({S_{\left. {\overline {\, n \,}}\! \right| }} = {a_{\left. {\overline {\, n \,}}\! \right| }}{\left( {1 + i} \right)^n}\)
- \(\frac{1}{{{S_{\left. {\overline {\, n \,}}\! \right| }}}} + i = \frac{1}{{{a_{\left. {\overline {\, n \,}}\! \right| }}}}\)
- \(\frac{1}{{{a_{\left. {\overline {\, n \,}}\! \right| }}}} + i = \frac{1}{{{S_{\left. {\overline {\, n \,}}\! \right| }}}}\)
- Hanya I
- Hanya II
- Pernyataan I dan II
- Pernyataan I dan III
- Semua salah
| Diketahui | Diketahui 3 pernyataan:
|
| Rumus yang digunakan | \({a_{\left. {\overline {\, n \,}}\! \right| }} = \frac{{1 – {v^n}}}{i}\) \({S_{\left. {\overline {\, n \,}}\! \right| }} = \frac{{{{(1 + i)}^n} – 1}}{i}\) |
| Proses pengerjaan | Pernyataan I:
\({\rm{ }}{S_{\left. {\overline {\, n \,}}\! \right| }} = {a_{\left. {\overline {\, n \,}}\! \right| }}{\left( {1 + i} \right)^n}\)
\(( \Leftarrow ){\rm{ }}{S_{\left. {\overline {\, n \,}}\! \right| }} = \frac{{1 – {v^n}}}{i}{\left( {1 + i} \right)^n}\)
\(( \Leftarrow ){\rm{ }}{S_{\left. {\overline {\, n \,}}\! \right| }} = \frac{{1 – {{(1 + i)}^{ – n}}}}{i}{\left( {1 + i} \right)^n}\)
\(( \Leftarrow ){\rm{ }}{S_{\left. {\overline {\, n \,}}\! \right| }} = \frac{{1 – \frac{1}{{{{(1 + i)}^n}}}}}{i}{\left( {1 + i} \right)^n}\)
\(( \Leftarrow ){\rm{ }}{S_{\left. {\overline {\, n \,}}\! \right| }} = \frac{{\frac{{{{(1 + i)}^n}}}{{{{(1 + i)}^n}}} – \frac{1}{{{{(1 + i)}^n}}}}}{i}{\left( {1 + i} \right)^n}\)
\(( \Leftarrow ){\rm{ }}{S_{\left. {\overline {\, n \,}}\! \right| }} = \frac{{\frac{{{{(1 + i)}^n} – 1}}{{{{(1 + i)}^n}}}}}{i}{\left( {1 + i} \right)^n}\)
\(( \Leftarrow ){\rm{ }}{S_{\left. {\overline {\, n \,}}\! \right| }} = \frac{{{{(1 + i)}^n} – 1}}{{i{{(1 + i)}^n}}}{\left( {1 + i} \right)^n}\)
\(( \Leftarrow ){\rm{ }}{S_{\left. {\overline {\, n \,}}\! \right| }} = \frac{{{{(1 + i)}^n} – 1}}{i}\)
maka \({\rm{ }}{S_{\left. {\overline {\, n \,}}\! \right| }} = {a_{\left. {\overline {\, n \,}}\! \right| }}{\left( {1 + i} \right)^n}\) Pernyataan II \(\frac{1}{{{S_{\left. {\overline {\, n \,}}\! \right| }}}} + i = \frac{1}{{{a_{\left. {\overline {\, n \,}}\! \right| }}}}\) \(( \Rightarrow ){\rm{ }}\frac{1}{{{S_{\left. {\overline {\, n \,}}\! \right| }}}} + i = \frac{i}{{{{(1 + i)}^n} – 1}} + i\) \(( \Rightarrow ){\rm{ }}\frac{1}{{{S_{\left. {\overline {\, n \,}}\! \right| }}}} + i = \frac{{i + i{{(1 + i)}^n} – i}}{{{{(1 + i)}^n} – 1}}\) \(( \Rightarrow ){\rm{ }}\frac{1}{{{S_{\left. {\overline {\, n \,}}\! \right| }}}} + i = \frac{i}{{1 – {v^n}}}\) maka \(\frac{1}{{{S_{\left. {\overline {\, n \,}}\! \right| }}}} + i = \frac{1}{{{a_{\left. {\overline {\, n \,}}\! \right| }}}}\)Pernyataan II benar maka pernyataan III tidak benar. |
| Jawaban | c. Pernyataan I dan II |


