ISRO | ISRO CS 2020 | Question 60

Minimum number of NAND gates required to implement the following binary equation (A’+B’)(C+D)
(A) 4
(B) 5
(C) 3
(D) 6


Answer: (A)

Explanation: Given (A’+B’)(C+D),

According to NAND gate property,

= (A'+B')(C+D)
= (A'+B')C + (A'+B')D
= (AB)'C + (AB)'D 
= [{(AB)'C}'.{(AB)'D}']' 

Therefore, 4 NAND gates are required.

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