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r^3 = 1/4 × 1/2
r^3 = 1/8
r = 1/2
S6 = 2(1 - 1/2^6)
1 - 1/2
= 2 (1 - 1/64)
1/2
= 2 × 63/64 ÷ 1/2
= 2 × 63/64 × 2
= 252/64
= 3 60/64
= 3 15/16