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b = 2
U1 , U2, U3 = x, x+2, x+4
75 = x + x + 2 + x + 4
75 = 3x + 6
75 - 6 = 3x
69 = 3x
x = 69/3
x = 23
terkcil + terbesar = U1 + U3 = x + x + 4 = 23 + 23 + 4 = 23 + 27 = 50