Careful when Don't care terms are present in your function

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Please verify my approach for calculation the minimal POS form for a function **f**.

STEPS:

- Find out the
**f' in sum of minterms.** - Minimize
**f'**and find out minimal SOP form. - Using DeMorgan's law, find out
**f**. The calcuated f will be minimal and in SOP form.

Till now, **I have been able to solve questions** using this approach. However, **I need a confirmation whether this method is actually correct** and is bound to give me correct results all the time..!