Jawabanmu

2014-03-06T07:33:18+07:00
Un = a + (n-1)b
U50 = 4 + (50-1)4
       = 4 +49.4
       =4 + 196
       =200
2014-03-06T07:34:12+07:00
Un = a+(n-1)b

U50 = 4+(50-1)4
U50 = 4+ (49)4
U50 = 4+196
U50=200