*Here f2 should be : f*2(*x*,*y*,*z*)=Σ(6,5) as given in original paper.

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Consider the following logic circuit whose inputs are functions $f_1, f_2, f_3$ and output is $f$

Given that

$f_1(x,y,z) = \Sigma (0,1,3,5)$

$f_2(x,y,z) = \Sigma (6,7),$ and

$f(x,y,z) = \Sigma (1,4,5).$

$f_3$ is

- $\Sigma (1,4,5)$
- $\Sigma (6,7)$
- $\Sigma (0,1,3,5)$
- None of the above

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