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use strict;
use warnings;
...
    return $nums[$number - 1];  # Remember array index are 0-based.
                                # Hence the -1.
}

# my $num2 = getNumberBetweenXandY(1, 5);        # Change this...
my $num2 = getNumberBetweenXandY(1, 9 - $num1);  # Into this.

Type in a single number between one and four >one
Enter 1, 2, 3, or 4 please.
...
Type in a single number between one and five >5

Two plus five equals seven.