Question
Bahasa Melayu
Sebutan keempat bagi suatu janjang aritmetik ialah 14 dan sebutan kesembilannya ialah 34.
Dengan menggunakan rumus $S_n = \frac{n}{2}[2a + (n - 1)d]$, dengan keadaan $a$ mewakili sebutan pertama dan $d$ mewakili beza sepunya janjang itu, cari hasil tambah 25 sebutan pertamanya.
Dengan menggunakan rumus $S_n = \frac{n}{2}[2a + (n - 1)d]$, dengan keadaan $a$ mewakili sebutan pertama dan $d$ mewakili beza sepunya janjang itu, cari hasil tambah 25 sebutan pertamanya.
English
The fourth term of an arithmetic progression is 14 and its ninth term is 34.
Using the formula $S_n = \frac{n}{2}[2a + (n - 1)d]$, where $a$ denotes the first term and $d$ the common difference of the progression, find the sum of its first 25 terms.
Using the formula $S_n = \frac{n}{2}[2a + (n - 1)d]$, where $a$ denotes the first term and $d$ the common difference of the progression, find the sum of its first 25 terms.
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Modelled on Selangor trial · Kertas 1 · Q10(b)
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Modelled on Selangor trial · Kertas 1 · Q10(b)
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