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My teacher have give me a question is like this.

Design a 2-of-5 Code to BCD 8421 Code converter. Minimize each of the output to SOP form using Q-M method and draw the circuit diagram using basic gates (i.e. AND, OR, NOT gates).

Can I treat the non 2-of-5 code output as logic 0 insteat of don't-care terms? because I dont have any idea how to do the QM method without error with 22 dont care term. =.='

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Yes, you can. Since she didn't specify what to do with invalid input, you can do what you wish. However using don't cares will result in a smaller result.

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