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= 10
U25=6.25-110= 40
Un=a+(n-1)b
u20= -104+(20-1)6
u20= -104+(19)6
u20= -104+114
u20=10
u25= -104+(25-1)6
u25=-104+(24)6
u25= -104+144
u25=40
u20+u25= X
10+40+ 50
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