In K-map, you might find some cells filled with the letter d (or X). This d is called "Don't care". There may arise a case when for a given combination of input, we may not have a specified output, or the input combination may be invalid. The combinations for which we don't have any output expression specified are called don't care combination. When forming groups of cells, don't care conditions (d) are considered as 1, if it helps
In K-map, you might find some cells filled with the letter d (or X). This d is called "Don't care". There may arise a case when for a given combination of input, we may not have a specified output, or the input combination may be invalid. The combinations for which we don't have any output expression specified are called don't care combination. When forming groups of cells, don't care conditions (d) are considered as 1, if it helps
Chapter7: Input/output Technology
Section: Chapter Questions
Problem 28VE
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