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Clearly, there will be two essential prime implicants. Why answer is 3?

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From the prime implicant chart we can say 2 expressions possible for the given boolean function

Exp 1:AC+A'C'+B

Exp 2:AC+A'C'+A'B'+AB'

The number of literals  for Exp 1  is less than Exp 2 .

So we consider Exp 1, for which we have 3 implicants.

OPTION B is the answer.

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