Quiz Barisan dan Deret Aritmatika
Quiz
•
Mathematics
•
11th Grade
•
Medium
Kamela Fauziah
Used 6+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Diketahui barisan aritmetika: 4,1,−2,−5,⋯. Suku ke-10 barisan tersebut adalah ⋯
A. 31
B. 23
C. -23
D. -26
E. -31
Answer explanation
Penyelesaian:
Diketahui: 𝑎 = 4 dan 𝑏= −3. Dengan demikian,
U𝑛 = 𝑎+ (𝑛−1)𝑏
U10 = 4+(10−1).(−3)
= 4+9.(−3)
= 4−27
= −23
Jadi, suku ke-10 barisan aritmetika tersebut adalah −23.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Suku ke-𝑛 suatu barisan bilangan dirumuskan U𝑛=15−3𝑛. Suku ke-15 dari barisan tersebut adalah ⋯⋅
30
15
0
-15
-30
Answer explanation
Penyelesaian:
Diketahui U𝑛=15−3𝑛.
Untuk 𝑛=15, diperoleh
U15 = 15−3.(15)
= 15−45
= −30.
Jadi, suku ke-15 dari barisan tersebut adalah −30
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Diketahui suku ke-5 dan suku ke-9 dari suatu barisan bilangan aritmetika adalah 18 dan 6. Suku ke-3 barisan tersebut adalah ⋯
9
12
15
21
24
Answer explanation
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Dari suatu deret aritmetika, diketahui suku pertama adalah 20 dan suku keenam adalah 40. Jumlah sepuluh suku pertama dari deret tersebut adalah ⋯
340
350
360
370
380
Answer explanation
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Hitunglah jumlah 20 suku pertama pada deret 4 + 5 + 6 + 7 =. . .
260
265
268
270
272
Answer explanation
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Diketahui barisan aritmetika 3, 19, 35, … dan antara tiap dua suku yang berurutan disisipkan 3 buah bilangan sehingga terbentuk barisan aritmetika baru. Tentukan beda barisan aritmetika baru!
1
2
3
4
Answer explanation
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Tentukan suku tengah dari barisan aritmetika 5, 8, 11, 14, … , 77.
30
31
40
41
42
Answer explanation
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