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colour the building

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striderjebby | 00:41 Fri 22nd Jul 2011 | Crosswords
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there is a 10 storey building.you can colour it only by pink or green.but no two adjacent storeys can be pink.what is the total number of colouring the stories??
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For a different challenge why not take a look at this week’s Azed Crossword:

http://image.guardian...7/12/2042-july-17.pdf
One - all green.
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colour the building

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