GATE 2010
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Question 6
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The minterm expansion of 
is
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m2+m4+m6+m7
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m0+m1+m3+m5
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m0+m1+m6+m7
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m2+m3+m4+m5
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Question 6 Explanation:
Convert PQ + QR’ + PR’ into canonical form
= PQR + PQR’ + PQR’ + P’QR’ + PQR’ + PQ’R’
= PQR + PQR’ + P’QR’ + PQ’R’
= m7 + m6 + m2 + m4
= PQR + PQR’ + PQR’ + P’QR’ + PQR’ + PQ’R’
= PQR + PQR’ + P’QR’ + PQ’R’
= m7 + m6 + m2 + m4
Correct Answer: A
Question 6 Explanation:
Convert PQ + QR’ + PR’ into canonical form
= PQR + PQR’ + PQR’ + P’QR’ + PQR’ + PQ’R’
= PQR + PQR’ + P’QR’ + PQ’R’
= m7 + m6 + m2 + m4
= PQR + PQR’ + PQR’ + P’QR’ + PQR’ + PQ’R’
= PQR + PQR’ + P’QR’ + PQ’R’
= m7 + m6 + m2 + m4
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