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a) U1 = x
U2 = x + 1
b) 25 = U1 + U2
25 = x + x + 1
25 = 2x +1
25-1 = 2x + 1 - 1
24 = 2x
1/2 x 24 = 1/2 x 2x
12 = x
bilangan pertama = x = 12
bilangan kedua = x + 1 = 12 + 1 = 13