Boolean expression KMAP

Question

Comments

If i form the kmap of it there is a quad in which every one is redundant so answer should be Zero is it correct ?

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$5,7,13,15$ is forming a Quad.

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Answer given is zero brother because that quad is redundant 

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yes zero is correct, no need of quad in minimal SOP form

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Yes, because all pairs are EPIs. And these EPIs covers all the min-terms. So minimal SOP will consist of EPIs only in this questions.

Answer 1

Every quad is redundant here so there is no quad