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John Simmons / outlaw programmer wrote:

Real programmers start counting with 0

Kornfeld Eliyahu Peter wrote:

which is the most frequent digit in the list of numbers form 1 to 1000?

2 it the least frequent, with only one instance.
0 is the most frequent, with three instances.
Poor old 1 has only two instances in the collection {1, 2, 1000}

Enumerable.Range(1, 1000)
    .SelectMany(i => i.ToString())
    .GroupBy(d => d, (Digit, items) => new { Digit, Count = items.Count() })
    .Dump();

Digit | Count
-------------
1     | 301 
2     | 300 
3     | 300 
4     | 300 
5     | 300 
6     | 300 
7     | 300 
8     | 300 
9     | 300 
0     | 192 

   1
  10
  11
 100
 101
 110
 111
1000