A move is one circle being moved to another place.
Here's an image of what I'm talking about;
Which is able to be done in 3 moves.
A more challenging one-
How many moves minimum?
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6$\begingroup$ You'll need to specify what a "move" is. $\endgroup$ – Duncan May 24 '16 at 23:31
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The number of moves required is:
18
The formula is:
$$h = \text{height of triangle}\\\text{moves}=\left\lfloor\dfrac{h(h+1)}6\right\rfloor$$
Image of solution:
