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9]
0.. ,.. 2 .., ..6.. ,...12.. ,..20 , ...
...+2.....+4....+6......+8
.......+2.....+2.....+2
2a = 2
a = 2/2
a = 1
3a + b = 2
3(1) + b = 2
3 + b = 2
b = 2 - 3
b = -1
a + b + c = 0
1 + (-1) + c = 0
c = 0
Un = an^2 + bn + c
Un = 1n^2 + (-1)n + 0
Un = n^2 - n
Un = n(n - 1) (C)
10]
5/3 , 7/4 , 9/5 , 11/6 , ...
pembilang :
a = 5
b = 7 - 5 = 2
Un = a + (n - 1) × b
Un = 5 + (n - 1) × 2
Un = 5 + 2n - 2
Un = 2n + 3
Penyebut :
a = 3
b = 4 - 3 = 1
Un = a + (n - 1) × b
Un = 3 + (n- 1) × 1
Un = 3 + n - 1
Un = n + 2
Un = (2n + 3)/(n + 2) (B)