Some of these squares are to be shaded so that:
(i) at least 2 squares are shaded
(ii) two squares meeting along an edge or at a corner are not both shaded.
How many ways are there to do this?
Kindly provided by UKMT The figure shown above is made from 7 small squares.
Some of these squares are to be shaded so that: (i) at least 2 squares are shaded (ii) two squares meeting along an edge or at a corner are not both shaded. How many ways are there to do this?
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September 2017
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