Jawabanmu

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2014-09-10T18:34:42+07:00
U8=a+7b=41
U3=a+2b=11
7b-2b=5b
41-11=30
jadi,5b=30
b=30÷5=6
a+7b=41
a+7×6=41
a+42=41
a=41-42
a=-1

U15=a+(n-1)b
=-1+(15-1)6
=-1+14×6
=-1+84
=83
jawabannya D
1 5 1