sample function output

gistfile1.txt

ruby-1.9.2-p290 :082 > a = [1,2,3,4,5]
 => [1, 2, 3, 4, 5] 
ruby-1.9.2-p290 :083 > a.sample
 => 5 
ruby-1.9.2-p290 :084 > a.sample
 => 4 
ruby-1.9.2-p290 :085 > a.sample
 => 5 
ruby-1.9.2-p290 :086 > a.sample
 => 4 
ruby-1.9.2-p290 :087 > a.sample
 => 5 
ruby-1.9.2-p290 :088 > a.sample
 => 4 
ruby-1.9.2-p290 :089 > a.sample
 => 2 
ruby-1.9.2-p290 :090 > a.sample
 => 3 



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Here I am trying to generate the random numbers with high randomness, if you see the above example you will see after 5 4 is coming but again 5 is coming this should not happen instad randomness of numbers should be high

Can any one has any idea.

Thanks
D