3 . ( a ) Show that n� .
2 2 2 2 ( 2n 1 ) ( 2n 3 ) ( 2n 5 ) 3 ( 4n 12n
11 ) 2 � � � � � � � � � , where
( b ) Hence , or otherwise , prove that the sum of the squares of any three consecutive odd numbers is greater than a multiple of 3 by 2 .
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