Mathematics
Junior High
(2)の問題の解説をお願いします!
1. 4本の当たりくじをふくおむ 10 本のくじがあ:
(1) 1本のくじを引いて当たりである確率
っ
5
(2) 2本のくじを同時に引いて 2本とも当たりであ
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