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In the Karnaugh map shown below, X denotes a don’t care term. What is the minimal form of the function represented by the Karnaugh map?

1. $\bar{b}.\bar{d} + \bar{a}.\bar{d}$

2. $\bar{a}.\bar{b} + \bar{b}.\bar{d} + \bar{a}.b.\bar{d}$

3. $\bar{b}.\bar{d} + \bar{a}.b.\bar{d}$

4. $\bar{a}.\bar{b} + \bar{b}.\bar{d} + \bar{a}.\bar{d}$

Value for First one is a'd' and value for 2nd one is b'd'.

Ans is Option A

selected
m0 ,m1,m8 ,m9 form one quad a'd'

So f=a'd'+b'd'

Ans is a
hi, why we are not taking m0,m4,m12,m8 means with dont care