The nurseryman brought six different varieties of trees to plant in six locations in the park. In how many different ways can he plant the trees?

several ways:

a circle
a straight line
a grid
a triangle
. . .

Be more specific. For example, how many of each variety? How many varieties per location?

I think I know what you mean, but that's not my job. Your job is to be so specific that you cannot be misunderstood.