Take a look at Puzzle No.211
Observe the last marked row. A sum of 10 with four cells has to be 1-2-3-4 using Unique Combinations. Hence the maximum value any of those four cells can take is 4.
Now observe the marked sum of 13. The sums can be 4-9, 5-8 or 6-7. Hence, the minimum number any of those two cells can take is 4.
The minimum value and the maximum value of the marked cell is 4. Hence, it has to be 4!
This technique can even be extended to non-overlapping range of values.
Other Solving Techniques
No comments:
Post a Comment