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U12 = 27
jadi,,,,
U3+U8=25
a+2b+a+7b=25
2a+9b=25
U12=27
a+11b=27
menentukan b :
2a+9b=25
a+11b =27
Diasamakan terlebih dahulu (atas x 1,
bawah x 2)
2a+9b =25
2a+22b=54
dikurangi,,,,
-13b=-29
b = 2
menentukan a :
a+11b= 27
a+11.2=27
a =27-22
a =5
menentukan U50 ;
Un=a+(n-1)b
U50=5+(50-1)2
U50=5+198
U50=203