Latihan Soal Deret Dan Baris Aritmatika

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| By Zaelaniaje
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Zaelaniaje
Community Contributor
Quizzes Created: 2 | Total Attempts: 7,847
| Attempts: 5,752
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  • 1/5 Pertanyaan
    1. Jumlah n suku pertama deret aritmatika dinyatakan dengan Sn = 2+4n. Suku ke-9 dari deret aritmatika tersebut adalah .......... - ProProfs

    1. Jumlah n suku pertama deret aritmatika dinyatakan dengan Sn = 2+4n. Suku ke-9 dari deret aritmatika tersebut adalah ..........

    • A. 30
    • B. 34
    • C. 38
    • D. 42
    • E. 46
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Latihan Soal Deret Dan Baris Aritmatika - Quiz

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  • 2. 

    2. Keuntungan seorang pedagang bertambah setiap bulan dengan jumlah yang sama. Jika keuntungan pada bulan pertama sebesar Rp. 46.000,00 dan pertambahan keuntungan setiap bulan Rp. 18.000,00 maka jumlah keuntungan sampai bulan ke-12 adalah .....

    • A. Rp. 1.740.000,00

    • B. Rp. 1.750.000,00

    • C. Rp. 1.840.000,00

    • D. Rp. 1.950.000,00

    • E. Rp. 1.200.000,00

    Correct Answer
    A. A. Rp. 1.740.000,00
    Explanation
    The monthly profit for the merchant increases by Rp. 18,000. So, to find the total profit until the 12th month, we need to calculate the sum of an arithmetic series. The formula for the sum of an arithmetic series is Sn = (n/2)(a + l), where Sn is the sum of the series, n is the number of terms, a is the first term, and l is the last term. In this case, n = 12, a = Rp. 46,000, and l = Rp. 46,000 + (12-1) * Rp. 18,000 = Rp. 46,000 + Rp. 198,000 = Rp. 244,000. Plugging in these values into the formula, we get Sn = (12/2)(Rp. 46,000 + Rp. 244,000) = 6 * Rp. 290,000 = Rp. 1,740,000. Therefore, the correct answer is A. Rp. 1,740,000.

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  • 3. 

    3. Dari suatu barisan aritmatika diketahui suku ke-5 adalah 22 dan suku ke-12 adalah 57. suku ke-15 barisan ini adalah ...

    • A. 62

    • B. 68

    • C. 72

    • D. 74

    • E. 76

    Correct Answer
    A. C. 72
    Explanation
    The given information states that the 5th term of the arithmetic sequence is 22 and the 12th term is 57. To find the common difference, we subtract the 5th term from the 12th term, which gives us 57 - 22 = 35. Now, we can use the common difference to find the 15th term. We add 35 to the 12th term to get 57 + 35 = 92. Therefore, the 15th term of the arithmetic sequence is 92, which corresponds to option C. 72.

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  • 4. 

    4. Dari suatu deret aritmatika diketahui suku ke-6 adalah 17 dan suku ke-10 adalah 33. Jumlah tiga puluh suku pertama deret itu adalah ...

    • A. 1.650

    • B. 1.710

    • C. 3.300

    • D. 4.280

    • E. 5.300

    Correct Answer
    A. A. 1.650
    Explanation
    The given question is asking for the sum of the first thirty terms of an arithmetic series. We are given that the 6th term is 17 and the 10th term is 33. From this information, we can find the common difference, which is 4. Using the formula for the sum of an arithmetic series, Sn = (n/2)(2a + (n-1)d), where a is the first term, n is the number of terms, and d is the common difference, we can substitute the values to find the sum. Plugging in a = 17, d = 4, and n = 30, we get Sn = (30/2)(2(17) + (30-1)(4)) = 15(34 + 29(4)) = 15(34 + 116) = 15(150) = 1,650. Therefore, the correct answer is A. 1,650.

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  • 5. 
    5. Sn adalah jumlah suku pertama deret aritmatika. Jika a adalah suku pertama dan b beda deret itu, maka nilai   - adalah ... - ProProfs

    5. Sn adalah jumlah suku pertama deret aritmatika. Jika a adalah suku pertama dan b beda deret itu, maka nilai   - adalah ...

    • A. 2 (a+nb) + 1

    • B. 2a + nb + 1

    • C. 2a + b(2n+1)

    • D. 2a + b(n+1)

    • E. a + nb + 1

    Correct Answer
    A. C. 2a + b(2n+1)
    Explanation
    The formula for the sum of the first n terms of an arithmetic series is Sn = (n/2)(2a + (n-1)b), where a is the first term and b is the common difference. In this question, the sum of the first n terms is given as Sn, so we can rewrite the formula as Sn = (n/2)(2a + (n-1)b). Simplifying this equation, we get Sn = n(a + b(n-1)/2). Comparing this equation with the options, we can see that option C, 2a + b(2n+1), matches the given equation. Thus, option C is the correct answer.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 11, 2013
    Quiz Created by
    Zaelaniaje

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