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Titik Fiona
Student IX
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Putra Gema Nusa
Rockstar Teacher GURU SMA
Sn = {(a + Un) & a= U,= awal Un = at(n-1)b) b = Un-Un- beda a. 1+3+5+7+gt tgg +2 +2 +2 +2 a=l, b=2 b. 1-2+3-4+6-6+ ...-100 =1+3+5+...+99 –(2+4+6+...+100) » 99 = 1+(1-1)2 -> 100 = 2+ (n-1)2 gg = 1+2n-2 2+2n-2 100 = > gg=1t(n-1)2 99 - ( + 21-2 gg = 2n-1 100 = 2n gg = 2n-1 n=50 n=50 100 = 20 U -> 550 = (1 + Uso) = 29(1+99) > S5o = 2 (2 + U50) 25 (2 + 100) n =50 U :. = 2500 = 2550 Svo - (1 + Uço) = 25 (1+99) = 25.100 = 2500 - 2650 =-50 = 2500 Pahamify
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