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un = 5 + (n- 1) 2
un = 5 + 2n - 2
un = 2n + 5 - 2
un = 2n + 3
u20 = 2n + 3
2 . 20 + 3
40 +3
43.
b) un = 100 + (n-1) -10
un = 100 + 10n + 10
un = 10n + 100 + 10
un = 10n + 110
u20 = 10n + 110
10 . 20 + 110
200 + 110
310.
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