Just a Nybble - Solution
by
Erik Oosterwal
The trick to solving this puzzle is the clue for 2 Across. Triangular
numbers are numbers for which the number of objects can be arranged to form
regular triangles. Those numbers include 1, 3, 6, 10, 15, 21, 28, ...
Since we know that our binary numbers must fit within 4 bits, we are
limited to the numbers 1, 3, 6, 10, and 15. The clue for 3 Down states that
2 Across must be less than 8 (otherwise "2 Across x 2" would be too large
to fit in 4 bits), so we are left with 2 Across being either 1, 3, or 6.
Trying them all provides us with the following solution:
Copyright E. Oosterwal - 2004
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