Current location - Training Enrollment Network - Mathematics courses - There are four different English books and six different math books on the shelf. (1) If books of the same type must be arranged together, how many ways are there?
There are four different English books and six different math books on the shelf. (1) If books of the same type must be arranged together, how many ways are there?
1, 2× (4× 3× 2×1)× (6× 5× 4× 3× 2×1) = 34560, 2 indicates two ways to put English books or math on the left or right.
2. English books can't be linked, so I think there is a method of 6×5×4×3×2× 1 to put the math books on first. When inserting English books between math books, * * * has 7 spaces to insert, and there is a 7×6×5×4 method. Just multiply the results.