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Function: get_footer
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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
나는 심심하면 문제를 낸다.
심심지수가 있는데 제일 심심한 것이 0, 제일 재밌는 것을 100이라 한다.
심심지수가 40 이하로 떨어졌을 때 바로 문제를 내고, 50 이상으로 올라갈 때까지 문제를 낸다.
한문제를 내면 심심지수가 3 올라가고 심심지수가 떨어질 때 20 떨어질 확률 10%, 10 떨어질 확률은 30%, 5 떨어질 확률은 60%이고,
한문제를 3분동안 내고 중간에 1분 쉴때,
20분 이상 문제를 낼 확률을 구하여라.
(단, 심심지수는 자연수)
-
유클리드
Lv.6
2020.08.19 20:26
한 문제를 내면 심심지수가 3 올라가거나 확률적으로 떨어진다는 것인가요?
-
아니요.
떨어질 때는 떨어지고 문제를 내면 무조건 올라갑니다.
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