The following expression was to be realized using $2$-input AND and OR gates. However, during the fabrication all $2$-input AND gates were mistakenly substituted by $2$-input NAND gates. $(a.b).c + (a'.c).d + (b.c).d + a. d$
What is the function finally realized ?
Option (C) is correct!
The final answer will come as:
Option is C.
what about this sol: https://gateoverflow.in/68706/go2017-digital-7
Please see the K-map. It is not 1