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r = 2/4 = ½
1/32 = 4 x ½ⁿ-¹
2^-5 = 2² x 2¹+ⁿ
2^-5 = 2³+ⁿ
n = -5-3 = -8
S8 = 2² x (1 - ½^8)/(1-½) = 2³ x (1 - 1/256) = 2³ : 2^8 x 255
= 255/32 = 7 31/32