2. a. 15
b. 35
3. U12 = 105
4. 96
5. 610
Penjelasan dengan langkah-langkah:
1. a. 5, 8, 11, 14, 17, 20, 23
+3 +3 +3 +3 +3 +3
15 harus dihilangkan
b. 1, 2, 3, 5, 8, 13, 21
angka ketigabdan seterusnya adalah penambahan 2 angka aebelumnya
13 + 21 = 34, maknya 35 harus dibuang
3. b = (U5 - U2) : (5-3)
= (35 - 15) : 2
= 20 : 2
= 10
U12 = U5 + (12 - 5)b
= 35 + 7 x 10
= 35 + 70
= 105
4. r^(5-2) = 48 : 6
r³ = 8
r = ³√8 = 2
U6 = U5 x (6-5)r
= 48 x 1 x 2
= 96
^ artinya pangkat
5. U1 = a = 2
b = 5 - 2 = 3
Sn = n/2 x (2a + (n-1)b)
S20 = 20/2 x (2 x 2 + (20-1)3)
= 10 x (4 + 19 x 3)
= 10 x (4 + 57)
= 10 x 61
= 610
[answer.2.content]
