If p,q and r are simple propositions suc...

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

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

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The correct Answer is:

B

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