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a= 2000
b = 25
U21 = .......?????
U21 = a + (n-1)b
= 2000 + (21 - 1).25
= 2000 + 20.25
=2000 + 500
=2500
25 x 20 = 500
jadi 2000 + 500 = 2500 (b)