Assuming your perl binary was compiled with enough RANDBITS and that you can store the entire array in memory, than yes, you can pull out a random element of the array.
For example, the following code generates an array with 100 elements in it, and retrieves the value of one element randomly selected:
my @a = map { rand(10) }(1..100);
print $a[int(rand(100))];
__OUTPUT__
4.65349565896584
You should be able to do something similar, except that your array would be bigger. Basically, the amount of memory would determine whether Perl could handle the process.
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