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U6 + U7 = 9
[a + (6-1)b] + [a + (7-1)b] = 9
[3 + 5b] + [3 + 6b] = 9
6 + 11b = 9
11 b = 9 - 6
11b = 3
b =
Un= 87
a + (n-1)b = 87
3 + (n-1)
3 +
3n = 957
n = 319
U50 = 3 + 49b
= 3 + 49
= 3 + 13,3
= 16,3
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