Предмет: Алгебра, автор: Jiroy

Пруд зарастает водяными лилиями. На первый день выросла одна лилия, на второй день — две лилии, на третий день — четыре лилии, на четвёртый день — восемь лилий, ... и так на каждый следующий день число лилий удваивалось. Наконец, на 42 день пруд зарос полностью.
На который день пруд зарос наполовину?

Ответы

Автор ответа: granny23

на один день раньше., т.е. на 41-й. А когда удвоилось количество лилий, то он зарос полностью.

Автор ответа: Jiroy

это и так ясно

Автор ответа: granny23

тогда зачем спрашиваешь

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