Numbers 1..n, one missing. 

#! /usr/bin/perl -wl

use List::Util qw( sum );

my @arr = (1..3,5..7);

print +- sum -1-@arr .. -1,@arr;

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In reply to Re: Find the missing number by oiskuu
in thread Better way of writing "find the missing number(s)" by pritesh_ugrankar

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