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A= x

B=y'z

N(A union B) = N(A) + N(B) - N(AB)

                         =2^4 + 2^3 - (2^2)

                          = 16 + 8 - 4

That is 20...

N(A) we have x in the minimize expression..remaining terms are v,w,y,z each one having two forms( simple and complement) so 2^4   ...

For N(B) same way 2^3 ...

But adding these two some terms are common we need to deduct it..which are 2^2 ...a
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