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= 288 / 2 = 144
b. Un = 144
a + (n-1)b = 144
(n-1) 5 = 140
n - 1 = 28
n = 29
c. Un = 284
a + (n-1)b = 284
(n-1) 5 = 280
n - 1 = 56
n = 57