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95040
Пошаговое объяснение:
Если бы уроки могли быть одинаковыми, количество вариантов расписания составляло бы 12^5
Учитывая то, что уроки должны быть различными, получаем формулу
\frac{12!}{(12-5)!} = \frac{12*11*...*2*1}{7*6*...*2*1}=12*11*10*9*8=95040
(12−5)!
12!
=
7∗6∗...∗2∗1
12∗11∗...∗2∗1
=12∗11∗10∗9∗8=95040