Tolong dijawab karena saya bego kalau mata pelajaran mtk​

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Tolong dijawab karena saya bego kalau mata pelajaran mtk​

Tolong dijawab karena saya bego kalau mata pelajaran mtk​

1. 1, 5, 9, 13, 17, 21

D. 17 dan 21

2. a = 1, b = 5 – 1 = 4

Sn = ½n { 2a + ( n – 1 ) b }

S5 = ½.5 { 2.1 + ( 5 – 1 ) 4 }

= ½.5 ( 2 + 4.4 )

= ½.5 ( 2 + 16 )

= ½.5.18

= 45 ( D. )

3. 1, 3, 9, 27, 81

C. 81

4. a = 1, b = 3/1 = 3

sn = frac{a(r {}^{n} - 1)}{r - 1} \ s5 = frac{1(3 {}^{5} - 1)}{3 - 1} \ = frac{243 - 1}{2} \ = frac{242}{2} \ = 121(c.)