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a=8, b= 15-8 =7
u80 = 8+(80-1)7
= 8 + (79)7
= 8 + 553
= 561
b= 15-8=7
u80=a(n-1)7
u80=8(80-1)7
u80=8.79.7
u80=632.7
u80= 4424