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r = -1/2
S(tkhingga) = a/(1-r)
= 8/(1+1/2)
= 8/(3/2)
= 8 x 2/3
= 16/3
= 5,33
2) a = 100
U3 = 25
a x r^2 = 25
100 x r^2 = 25
r^2 = 25/100
r^2 = 1/4
r = 1/2
S(takhingga) = a/(1-r)
= 100/(1-1/2)
= 100/(1/2)
= 100 x 2
= 200