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Verified answer
Jawba. 16 + 8+4 + ...
a= 16
r= 1/2
jumlahtak hingga = a/(1-r)
s~= 16/(1 - 1/2) = 16/(1/2)
s~ = 32
b. 5 , 15,, 45
a= 5
r= 3
s~ = ~