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10 = 5/(1 - r)
1 - r = 5/10
1 - r = 1/2
r = 1/2
S5 = a(1 - r^5)/(1 - r)
= 5(1 - (1/2)^5)/(1 - 1/2)
= 10(1 - 1/32)
= 10(31/32)
= 155/16
10 = 5 /(1 - r)
1 - r = 5/ 10
1 - r = 1/2
r = 1/2
S5 = 5 (1 - (1/2)^5) / (1 - 1/2)
= 5 ( 1 - 1/32) / 1/2
= 10 ( 31/32)
= 310/32