Jawabanmu

2014-08-30T09:50:28+07:00
U1+U2+3+....+U98+U99+U100
=(U1+U100)+(U2+U99)+....+(U49+U52)+ (U50+U51)
=U101 X 50
=U5050

atau pake rumus sn

Sn= n/2 dikali (a1 + an)
S100= 100/2 dikali (1+100)
S100=5050