Question

Tolong bantuin selesain ya dapet pahala juga​

Answer 1

Jawab:

Penjelasan dengan langkah-langkah:

Nomor 1 : C

5, 9, 13, 17, a, .....

Barisan aritmatika, dengan beda = 4

Nilai a = 17 + 4 = 21 (C)

Nomor 2 : A

3, 6, 9, ....

1 × 3 = 3

2 × 3 = 6

3 × 3 = 9

Pola ke-8 = 8 × 3 = 24 buah

Nomor 3 : C

2, 4, 7, 11, ......

11 + 5 = 16

16 + 6 = 22

Dua suku berikutnya = 16, 22

Nomor 4 : B

1, 3, 6, 10, .......

10 + 5 = 15

15 + 6 = 21

Dua suku berikutnya = 15, 21

Nomor 5 : B

2, 5, 9, ....., 20, 27, 35

Suku ke-4

= 9 + 5

= 14

Nomor 6 : A

24, 21, 18, .....

a = 24

b = 21 - 24 = -3

Uₙ = a + (n - 1)b = 24 + (n - 1)(-3)

U₇ = 24 + (7 - 1) (-3)

U₇ = 24 + 6. (-3)

U₇ = 24 - 18 = 6

Nomor 7 : C

2, 5, 8, 11, 14, ......

bertambah 3 setiap barisan menjadi :

17, 20, 23, 26, 29, 32, .....

Nomor 8 : C

Un = 4n² - 2

U₃ = 4. 3² - 2 = 4 . 9 - 2 = 36 - 2 = 34

U₂ = 4. 2² - 2 = 4 . 4 - 2 = 16 - 2 = 14

U₃ - U₂ = 34 - 14 = 20

Nomor 9 : B

5, 7, 9, 11

a = 5, b = 7 - 5 = 2

Uₙ = a + (n - 1)b = 5 + (n - 1)2 = 5 + 2n - 2 = 2n + 3

Nomor 10 : B

Un = 2 × 3ⁿ

U₁ = 2 × 3¹ = 6

U₂ = 2 × 3² = 18

U₃ = 2 × 3³ = 54

U₄ = 2 × 3⁴ = 162

Barisan Bilangan = 6, 18, 54, 162 (B)

Nomor 11 : A

-3, 2, 7, 12

a = -3

b = 2 - (-3) = 5

Un = a + (n - 1)b = -3 + (n - 1). 5 = -3 + 5n - 5 = 5n - 8 (A)