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U7=31
U51= ?
a+b=6
a+6b=31
eliminasi dengan mengurangkannya
-5b = -25
b = -25/-5
= 5
a+b = 6
a+5 = 6
a = 6-5
= 1
U51 = a+(n-1)b
= 1+ (51-1).5
= 1 + (50).5
= 1 + 250
= 251
u7=31
u2=6
a+b=6
u7=31
a+6b=31
eliminasi
a+6b=31
a+b = 6 _
5b=25
b=25/5
b= 5
substitusi
a+b=6
a+5=6
a=6-5
a=1
u51
= a+(50 b)
= 1 + (50 x 5)
= 1 + 250
=251
u51=251