October 2018 2 18 Report
Tolong dong bsok di kumpul
a. bila a=3 .b=2. dan Un= -11, hitunglah n dan Sn
b. bila a=5 dan U10= 56,carilah b dan S18
c. bila a=-5 .n=10 dan b=4, carilah U10 dan S10

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