Jawabanmu

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2014-04-17T18:36:27+07:00
A=20 | b=-3 | U50=20+49×-3=20-147=-127
1 5 1
2014-04-17T18:36:59+07:00
U 50 = a + ( n-1 ) b 
          20 + ( 50-1 ) 3
          20 + (49) 3 
          20 + 147 
          = 167