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  5. ABCDの4人の中から役員を2人決めます。...
Mathematics
Junior High
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ナムさんのえくぼ‪ꪔ̤̮
ナムさんのえくぼ‪ꪔ̤̮

ABCDの4人の中から役員を2人決めます。
AとBが選ばれない確率は？？
→6分の1ですか？？

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