A) p, q, r are all false
B) p, q, r are all true
C) p, q are true and r is false
D) p is true and q and r are false
Correct Answer: B
Solution :
\[(p\wedge q)\wedge (q\wedge r)\]is true means \[p\wedge q,q\wedge r\]are both true, it implies that p, q, r are all true.
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