Mathematics
Senior High
Resolved

1~5で三桁を作り、521のように、左から大きい順の整数は何個あるか。
答え、10個
この解き方を教えてください。

Answers

✨ Best Answer ✨

3個を選び大きい順にならべるのと同義
5C3 = 10

ありがとうございます🙇‍♀️

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