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a + 4b = 17
u10 = 32
a + 9b = 32
(a + 4b = 17) - (a+9b = 32)
b = 3
a + 4b = 17
a + 4(3) = 17
a + 12 = 17
a = 17-12 = 5
Un = a + (n-1) b
= 5 + (n-1)3
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