If p, q and r are simple propositions such that (p∧q)∧(q∧r) is true, then

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p, q and r are all false

p, q and r are all true

p, q are true and r is false

p is true and q, r are false

answer is B.

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Detailed Solution

(p∧q)∧(q∧r) is true which means that p∧q and q∧r are both true. Therefore, p, q and r are all true.

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