Quiz Barisan dan Deret Aritmatika
Quiz
β’
Mathematics
β’
11th Grade
β’
Practice Problem
β’
Medium
Kamela Fauziah
Used 6+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min β’ 1 pt
Diketahui barisan aritmetika: 4,1,β2,β5,β―. Suku ke-10 barisan tersebut adalah β―
A. 31
B. 23
C. -23
D. -26
E. -31
Answer explanation
Penyelesaian:
Diketahui: π = 4 dan π= β3. Dengan demikian,
Uπ = π+ (πβ1)π
U10 = 4+(10β1).(β3)
= 4+9.(β3)
= 4β27
= β23
Jadi, suku ke-10 barisan aritmetika tersebut adalah β23.
2.
MULTIPLE CHOICE QUESTION
1 min β’ 1 pt
Suku ke-π suatu barisan bilangan dirumuskan Uπ=15β3π. Suku ke-15 dari barisan tersebut adalah β―β
30
15
0
-15
-30
Answer explanation
Penyelesaian:
Diketahui Uπ=15β3π.
Untuk π=15, diperoleh
U15 = 15β3.(15)
= 15β45
= β30.
Jadi, suku ke-15 dari barisan tersebut adalah β30
3.
MULTIPLE CHOICE QUESTION
1 min β’ 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 β―
9
12
15
21
24
Answer explanation
4.
MULTIPLE CHOICE QUESTION
1 min β’ 1 pt
Dari suatu deret aritmetika, diketahui suku pertama adalah 20 dan suku keenam adalah 40. Jumlah sepuluh suku pertama dari deret tersebut adalah β―
340
350
360
370
380
Answer explanation
5.
MULTIPLE CHOICE QUESTION
1 min β’ 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 β’ 1 pt
Diketahui barisan aritmetika 3, 19, 35, β¦ 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 β’ 1 pt
Tentukan suku tengah dari barisan aritmetika 5, 8, 11, 14, β¦ , 77.
30
31
40
41
42
Answer explanation
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