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r = u2/u1
r = 2/10
r = 1/5
s~ = a / 1 - r
s~ = 10 / 1 - 1/5
s~ = 10 / 4/5
s~ = 10 × 5/4
s~ = 50/4
s~ = 12,5
jadi s~ dari deret tersebut adalah 12,5