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a = 2
Dit : S10
Jb : carilah rasio (r)
U2/U1 = -4/2 = -2 (r<0)
Mka, Sn = (1-r^n)/1-r
S10 = (1- (-2)^10)/1- (-2)
= (1- (1024)/3
= -1023/3
S10 = -341