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二酸化炭素はCO₂なので、Cが1つ、Oが2つ必要です

Cの選び方は2通り
Oの選び方は3つのうち重複を許して2つ選ぶので
(16,16),(17,17),(18,18),(16,17),(17,18),(16,18)の6通り
よって二酸化炭素分子の種類は 2×6=12 (種類)

Clearnote User

ありがとうございます

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