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b = 2
n=10
Un = a + b(n-1)
= 3 + 2(9)
= 3 + 18
= 21
n=100
Un = a + b(n-1)
= 3 + 2(99)
= 201
dan
Un = a + b(n-1)
Un = 3 + 2(n-1)
Un = 3 + 2n - 2
Un = 2n + 1