Moran Fleming
08/14/2023 · Middle School
По кругу расставлены девяносто горшков. В каждом из горшков сидит хотя бы одна лягушка, и в любых трёх стоящих подряд горшках суммарно сидит ровно четыре лягушки. Сколькими способами цапля Анастасия сможет выбрать два горш чтобы в них суммарно оказалось ровно три лягушки?
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