- 20
- 21
- 24
- 25

Option 3 : 24

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Let the top side be red. And the bottom and front be green. And the remaining are blue.

The edge pieces in top has only 2 colors. And the top corner pieces at the back has 2 colors. 6 pieces.

The top corner pieces at the back has red and blue, 2 pieces.

In the middle layer, the front edge pieces has two colors, green and blue, 2 pieces.

In the bottom layer, except the front edge and the centerpiece, everything has two colors, green and blue. 7 pieces.

So 15 pieces in total.

Hence, 24 is the right answer.
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