( e ) By using ( c ) and ( d ), suggest similar expressions for an
� 1, an � 2 and n 3 in terms of S
1
, S
2 and S
3
.
( f ) By using the above results , solve the system of equations �u � v � w �14
� 2 2 2
�u � v � w � 86 , where u �v � w.
� 3 3 3
�u � v � w � 560 a �
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