Покрытие доски 10×10

Докажите, что шахматную доску 10×10 нельзя покрыть фигурками следующего вида:

Покрытие шахматной доски 10x10

Ответ: Каждая фигурка указанного вида покрывает три клетки одного цвета и одну клетку другого (три клетки чёрного цвета и одну белого, либо наоборот). Поскольку всего на шахматной доске чёрных и белых клеток поровну, то количество фигурок, содержащих три белые клетки и одну чёрную, должно совпадать с количеством фигурок, содержащих три чёрные клетки и одну белую. Следовательно, общее количество фигурок должно быть чётным. Однако это невозможно, так как общее количество фигурок - 25.

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откуда это "так как общее количество фигурок - 25."?!

На доске всего 100 клеток, одна фигурка занимает 4 клетки. Вот и считай (с)

100? Не 64 клетки, нет?

Внимательно читать условие надо!!!