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( 1 ) Apply DeMorgan s law to p ( q r s ) . ( 3 ) Let D ( x , y ,

(1) Apply DeMorgans law to p (q r s).
(3) Let D(x, y, z) be the predicate x
2+ y
2= z
2 where x, y, z are integers. Evaluate
(a) D(5,12,13)
(b) D(1,1,2)

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