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U2 = a + b
8 = a + 3
a = 5
U10 = a + 9b
........= 5 + 9(3)
.........= 5 + 27
..........= 32
U2 = a + b
8 = a + 3
a = 8 - 3
a = 5
Un = a + (n - 1).b
U10 = 5 + (10 - 1).3
= 5 + 9. 3
= 5 + 27
= 32