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U4 = 2
ar³ = 2
16 r³ = 2
r³ = ⅛
r = ½
S5 = (1–½³½²) ÷ (1–½)
= (1 – ⅛¼) ÷ (½)
= (32/32 – 1/32) x 2
= (31/32) x 2
= 31/16
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