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U2 = U1 x b = 7 -
3b = 15
b = 5
u1xb = 7
u1x5 = 7
u1 = 7/5
U10 = U1 x 9b
= 7/5 x 9.5
= 63
u2 = a+(2-1)b
7 = a+(1)b
a+b = 7 ...(pers 1)
u5 = a+(5-1)b
22 = a+4b ...(pers 2)
eliminasi. dapat a = 2, b = 5.
u10 = a+(10-1)b
u10 = 2+(9)5
u10 = 47