1. 120 30 10 5 …
A. 1
B. 2
C. 3
D. 4
E. 5
PEMBAHASAN :
u1 = 120
u2 = u1 : 4 = 30
u3 = u2 : 3 = 10
u4 = u3 : 2 = 5
u5 = u4 : 1 = 5
JAWABAN : E
2. 2 3 5 9 17 …
A. 23
B. 27
C. 33
D. 34
E. 40
PEMBAHASAN :
u1 = 2
u2 = u1 + 1 = 3
u3 = u2 + 2 = 5
u4 = u3 + 4 = 9
u5 = u4 + 8 = 17
u6 = u5 + 16 = 33
JAWABAN : C
3. 100 6 90 18 80 …
A. 36
B. 45
C. 48
D. 54
E. 72
PEMBAHASAN :
u1 = 100
u3 = u1 – 10 = 90
u5 = u3 – 10 = 80
u2 = 6
u4 = u2 x 3 = 18
u6 = u4 x 3 = 54
JAWABAN : D
4. 1 1 1 2 1 4 1 …
A. 1
B. 2
C. 4
D. 8
E. 12
PEMBAHASAN :
u1 = u3 = u5 = u7 = 1 (konstan)
u2 = 1
u4 = u2 x 2 = 2
u6 = u4 x 2 = 4
u8 = u6 x 2 = 8
JAWABAN : D
5. 0.5 2.5 1 7.5 3 22.5 12 …
A. 34.5
B. 60
C. 60.5
D. 67
E. 67.5
PEMBAHASAN :
u1 = 0.5
u3 = u1 x 2 = 1
u5 = u3 x 3 = 3
u7 = u5 x 4 = 12
u2 = 2.5
u4 = u2 x 3 = 7.5
u6 = u4 x 3 = 22.5
u8 = u6 x 3 = 67.5
JAWABAN : E
6. 10, 24, 38, 52, …
A. 54
B. 56
C. 60
D. 64
E. 66
PEMBAHASAN :
u1 = 10
u2 = u1 + 14 = 24
u3 = u2 + 14 = 38
u4 = u3 + 14 = 52
u5 = u4 + 14 = 66
JAWABAN : E
7. 7, 3, 14, 6, 21, 9, …
A. 30
B. 28
C. 27
D. 25
E. 24
PEMBAHASAN :
u1 = 7
u3 = u1 + 7 = 14
u5 = u3 + 7 = 21
u7 = u5 + 7 = 28
JAWABAN : B
8. 1, 1, 4, 5, 7, 9, 10, …
A. 12
B. 13
C. 14
D. 15
E. 16
PEMBAHASAN :
u1 = 1
u3 = u1 + 3 = 4
u5 = u3 + 3 = 7
u7 = u5 + 3 = 10
u2 = 1
u4 = u2 + 4 = 5
u6 = u4 + 4 = 9
u8 = u6 + 4 = 13
JAWABAN : B
9. 2, 2, 4, 5, 7, 8, 11, …
A. 9
B. 10
C. 11
D. 12
E. 13
PEMBAHASAN :
u1 = 2
u3 = u1 + 2 = 4
u5 = u3 + 3 = 7
u7 = u5 + 4 = 11
u2 = 2
u4 = u2 + 3 = 5
u6 = u4 + 3 = 8
u8 = u6 + 3 = 11
JAWABAN : C
10. 6, 12, 13, 18, 27, 30, 48, …
A. 48
B. 50
C. 52
D. 54
E. 56
PEMBAHASAN :
u1 = 6
u3 = u1 + 7 = 13
u5 = u3 + 14 = 27
u7 = u5 + 21 = 48
u2 = 12
u4 = u2 + 6 = 18
u6 = u4 + 12 = 30
u8 = u6 + 18 = 48
JAWABAN : A
11. 3, 4, 9, 8, 21, 16, 39, 28, …
A. 63
B. 54
C. 48
D. 34
E. 30
PEMBAHASAN :
u1 = 3
u3 = u1 x 3 = 9
u5 = u1 x 7 = 21
u7 = u1 x 13 = 39
u7 = u1 x 21 = 63
JAWABAN : A
12. 47, 46, 45, 31, 30, 29, 28, 14, …
A. 13
B. 16
C. 19
D. 21
E. 24
PEMBAHASAN :
u1 = 47
u2 = u1 – 1 = 45
u3 = u2 – 1 = 27
u4 = 31
u5 = u4 – 1 = 30
u6 = u5 – 1 = 29
u7 = u6 – 1 = 28
u8 = 14
u9 = u7 – 1 = 13
JAWABAN : A
13. 9, 9, 15, 16, 21, 25, 27, …
A. 32
B. 33
C. 34
D. 35
E. 36
PEMBAHASAN :
u1 = 9
u3 = u1 + 6 = 15
u5 = u3 + 6 = 21
u7 = u5 + 6 = 27
u2 = 9
u4 = u2 + 7 = 16
u6 = u4 + 9 = 25
u8 = u6 + 11 = 36
JAWABAN : E
14. 95, 77, 61, 47, …
A. 32
B. 34
C. 35
D. 36
E. 38
PEMBAHASAN :
u1 = 95
u2 = u1 – 18 = 77
u3 = u2 – 16 = 61
u4 = u3 – 14 = 47
u5 = u4 – 12 = 35
JAWABAN : C
15. 3, 6, 12, 21, …
A. 33
B. 34
C. 35
D. 36
E. 37
PEMBAHASAN :
u1 = 3
u2 = u2 + 3 = 6
u3 = u2 + 6 = 9
u4 = u3 + 9 = 21
u5 = u4 + 12 = 33
JAWABAN :
16.,
,
,
,
A.
B.
C.
D.
E.
PEMBAHASAN :
u1 =
u2 = u1 + =
=
u3 = u2 + =
u4 = u3 + = 1
u5 = u4 + =
JAWABAN : D
NOTE : silahkan dikoreksi dan berikan komentar jika ada kesalahan atau masih ada keambiguan dalam penyelesaian soal-soal ini.