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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 and q and r false

D

p is true and r are false

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The correct Answer is:
B
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