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ISRO | ISRO CS 2009 | Question 19
  • Last Updated : 20 Nov, 2018
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The switching expression corresponding to
f (A,B,C,D) = Σ(1, 4, 5, 9, 11, 12) is:
(A) BC’D’ + A’C’D + AB’D
(B) ABC’ + ACD + B’C’D
(C) ACD’ + A’BC’ + AC’D’
(D) A’BD + ACD’ + BCD’


Answer: (A)

Explanation: The K-Map for the boolean function of four variables can be drawn as:

f (A,B,C,D) = BC’D’ + A’C’D + AB’D

So, option (A) is correct.

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