A rectangular field has 8 holes labelled A to H dug out. Eight different species of trees are to be planted into the holes.
Find the number of ways of planting the trees if two particular trees cannot be placed next to each other on the same side of the field.

Question

A rectangular field has 8 holes labelled A to H dug out. Eight different species of trees are to be planted into the holes. 
Find the number of ways of planting the trees if two particular trees cannot be placed next to each other on the same side of the field.

anonymous · Answer

attachment

anonymous · Answer

What does it means by "two particular trees"? Is that even a legit question?

anonymous · Answer

How do you solve this?

anonymous · Answer

Like how many ways this "particular tree" can be placed next to each other. How do you work it out then?

anonymous · Answer

its like for ex AB will not repeat like BA  etc..

anonymous · Answer

@ twitter

anonymous · Answer

i think thhis is like a circular permutation, the formula is (n-1)!=?