Mathematics
Senior High
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求め方が分からないので教えてください🙇♀️💭
(11) 駅が 21 ある区間で発駅と着駅を指定する片道乗車券を作るとき,何種類の片道乗車
券ができるか。
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求め方が分からないので教えてください🙇♀️💭
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ありがとうございます！