pola = 3 , 6 10
3. 4
1
U9 = 3 + 24 + 1/2 x 8 x 7
U9 = 27 + 28
U9 = 55
~Jawab~
a = 3 , 6 , 10
b = 3 , 4
c = 1
Un = a + (n - 1) b + (n - 1)(n - 2) × c/2
U9 = 3 + (9 - 1) 3 + (9 - 1)(9 - 2) × 1/2
U9 = 3 + 8.3 + 1/2 . 8 . 7
U9 = 3 + 24 + 28
∴ Jawaban: D.
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pola = 3 , 6 10
3. 4
1
U9 = 3 + 24 + 1/2 x 8 x 7
U9 = 27 + 28
U9 = 55
~Jawab~
Pola Bilangan
a = 3 , 6 , 10
b = 3 , 4
c = 1
Un = a + (n - 1) b + (n - 1)(n - 2) × c/2
U9 = 3 + (9 - 1) 3 + (9 - 1)(9 - 2) × 1/2
U9 = 3 + 8.3 + 1/2 . 8 . 7
U9 = 3 + 24 + 28
U9 = 55
∴ Jawaban: D.
Semoga Bermanfaat!