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✨ Best Answer ✨

(1)aₙに300加えたものの70%が次の日のaₙ₊₁に残る
よって、aₙ₊₁=(aₙ+300)×7/10=7/10×aₙ+210

(2)(1)の漸化式を解けば良いです

たま

ありがとうごさいます🙇

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