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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.

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What does it means by "two particular trees"? Is that even a legit question?
How do you solve this?

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Other answers:

Like how many ways this "particular tree" can be placed next to each other. How do you work it out then?
its like for ex AB will not repeat like BA etc..
@ twitter
i think thhis is like a circular permutation, the formula is (n-1)!=?

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