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Could someone solve this, i think i am making some mistake

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Lets simplify B :

Here 4 properties are used :

1. a + a' = 1

2. a + ab = a

3. a + a'b = a + b

4 . De Morgans Rule

Given , B  =  pq' (r's + st' + sr + t + pq'r + r')

                =  pq'(s + t + st' + pq'r + r')

                =  pq'(s + t + r' + pq')

                =  pq's + pq't + pq'r + pq'

                =  pq'

Hence  B'  = p' + q

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