= ( ( +( )
\ 1 \
x>0
(( )) () ( )...2014(23) ... ...
[QUOTE=ahmed;6587] x>0[/QUOTE
() \\
y ,X
(( )) ... ( )2014(22) ( ) ( )
ahmed y ,X x y
\ \
(2) () ( (x) ( )) : ( )
Permutations and combinations -
: 1 (0 1 )
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