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Mathematics
Senior High
鶴房
鶴房

解き方を教えてください

1 (16) 11 1 22 2° 2% 一2
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aporon
aporon

初項1/2、公比1/2、項数nの等比数列の和ですね
{1/2×(1-(1/2)ⁿ)}/(1-1/2)

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