Question:
I am considering this random string generator in perl:
sub generate_random_string { my $length = 12; my @chars = qw/2 3 4 5 6 7 8 9 A B C D E F G H J K M N P Q R S T U V W X Y Z/; my $str = ''; $str .= $chars[int rand @chars] for 1..$length; return $str; } How many unique strings will this generate? If I extend the length of the string, how many more unique strings are available?
Also, how do I calculate the probability of generating the same string twice (assuming the length of the string stays at 12)?
Solution:1
The answer is: (1/31) ^ 12
Or more generically: (1/(number of characters)) ^ length
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