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=4.
4+8=12
B. 8-15= -7
-7+21=14
C. 15-3=12
= 12-8=4
=4+3
=7
a) a= 2 dengan beda(b) = 2, dan Un=100
Un= a+(n-1)b
100= 2+ (n-1)2
100= 2+2n-2
100=2n
n= 100/2
n= 50
Sn= n/2 (a+Un)
Sn= 50/2 (2+100)
Sn= 25 (102)
Sn= 2.550 <------ jawaban
b) -1+2 = 1
100/2 = 50
Jadi jumlah = 1×50 = 50 <---- jawaban
c) a=-100 b=-1 Un=-1
Sn= n/2 (a+Un)
Sn= 100/2 (-100-1)
Sn= 50 (-101)
Sn= -5050
Kemudian:
a= 1 b=1 Un=99
Sn= n/2 (a+Un)
Sn = 99/2 (1+99)
Sn= 49,5 (100)
Sn= 4.950
Jumlah= -5050 + 4.950 = -100 <------ jawaban
"Mohon jadikan sbg jawabn terbaik ya,,,"