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For any three simple statement p,q,r the...

For any three simple statement `p,q,r` the statement `(p ^^ q) vv (q ^^ r)` is true when- (a) `p and r` true and p is false (b) `p and r` false and q is true (c) `p,q,r` all are false (d) `q and r` true `p` is false

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