An 20
18
16
14
• (6. 19.5)
• (5, 17.5)
(4.15.5)
(3, 13.5)
• (2. 11.5)
• (1.9.5)
12
10
8
6.
4
2+
1 2 3
4
5 6 7 8 9
n
O an=-23+2(n-1)
an= -2.75 +0.5(n-1)
oa, -9.5+ 2(n-1)
an= 11+0.5(n-1)
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