Tentukan nilai y=x+13+x+23+x+33+...+x+1003
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y diatas adalah deret hitung
banyak x sama dgn n deret tersebut
maka:
a=13
b=23-13=10
Un=a+(n-1)b
1003=13+(n-1)10
1003=13+10n-10
10n=1000
n=100
S100
=n/2(2a+(n-1)10)
=100/2(2.13+(100-1)10)
=50(26+990)
=50(1016)
=50800
Y=nx+S100=100x+50800