27 votes 27 votes The boolean function for a combinational circuit with four inputs is represented by the following Karnaugh map. Which of the product terms given below is an essential prime implicant of the function? $\text{QRS}$ $\text{PQS}$ $\text{PQ'S'}$ $\text{Q'S'}$ Digital Logic gateit-2006 digital-logic k-map normal + – Ishrat Jahan asked Oct 31, 2014 • edited Apr 25, 2019 by Sukanya Das Ishrat Jahan 6.0k views answer comment Share Follow See all 3 Comments See all 3 3 Comments reply Prateek kumar commented Sep 16, 2016 i edited by Lakshman Bhaiya Oct 14, 2019 reply Follow Share Total number of PI =7 Total number of EPI=1 //which match to all corners 1's =Q'S' 13 votes 13 votes Chhotu commented Dec 28, 2017 i edited by Chhotu Dec 28, 2017 reply Follow Share https://math.stackexchange.com/questions/20915/question-on-essential-prime-implicants https://gateoverflow.in/138655/prime-implicants-and-essential-prime-impliccants https://gateoverflow.in/80983/no-of-essential-prime-implicants 0 votes 0 votes svas7246 commented Jul 23, 2022 reply Follow Share Don't fall in the trap and take pq’s’ as the answer in the corners you need to take the biggest sub cube possible 0 votes 0 votes Please log in or register to add a comment.
Best answer 27 votes 27 votes Only the top leftmost and bottom rightmost $1s$ have no alternate groupings. So, they form the essential prime implicants. Answer is D. $Q'S'$ Ankit pipaliya answered Nov 30, 2017 • selected Apr 26, 2019 by Arjun Ankit pipaliya comment Share Follow See all 6 Comments See all 6 6 Comments reply Show 3 previous comments Rishabh Gopal Soni commented Aug 4, 2022 reply Follow Share prime implicant - is as big as possible essential prime implicant – prime implicant in which at least one term which is not covered by any other cube 0 votes 0 votes Abhrajyoti00 commented Jan 5, 2023 reply Follow Share # $EPI = 1 (Q’S’)$ # $PI = 7$ 1 votes 1 votes Hira Thakur commented Nov 1, 2023 reply Follow Share how many redundant EPI and selective EPI are here??? 0 votes 0 votes Please log in or register to add a comment.
18 votes 18 votes Essential prime implicants which $r$ grouped only by only one method or way, So, in above question cornor's ones r grouped by only one method, d ) will be the answer. saket nandan answered Jun 16, 2015 • edited Jun 26, 2018 by Milicevic3306 saket nandan comment Share Follow See all 0 reply Please log in or register to add a comment.