100 -comb . Henry takes a 200 × 200 grid of unit squares, and chooses
• Complete the cover sheet provided and attach it to
k of these squares and colours them so that James is unable to choose
the front of your script, followed by your solutions
150 uncoloured squares which form a 100-comb. What is the smallest
in question number order.
possible value of k?
• Staple all the pages neatly together in the top left
hand corner.
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