7
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A move is one circle being moved to another place.

Here's an image of what I'm talking about;

eazy

Which is able to be done in 3 moves.

A more challenging one-challenge-accepted

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
9
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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:

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