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In K-map it was found out that essential prime implicants are covering all terms except  2 minterms.
Those 2 minterms are in turn covered by 3 non-essential prime implicants each.
What is the number of minimal Sum of product expression?.

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First things we are going to add essential prime implicants in every min SOP  + Extra min terms we have to add

Here extra min term which is required is 2 .So we have to cover those 2 min terms using extra terms  .In order to cover each min terms they are saying that we have 3 choices    because they are saying that  2 minterms are in turn covered by 3 non-essential prime implicants each.

So      

essential prime implicants  +____+____  Here for each Blank we have 3 choices so  3*3 =9

9 Min Sop are possible.

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