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doubt essential prime implicant , how many prime implicants there

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essential prime implicant should be two or 3 (in this video he said you can either take AC or B'C) so three essential prime implicant

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Implicant: No. of all subcube i.e. every subcube is a implicant.

Prime Implicant: a subcube which cannot be completely covered by any other subcube.

Essential Prime Implicant: It covers atleast one minterm which is not covered by any other prime implicants.

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