"STD code" is an alternative name for an "area code" in the United Kingdom and several other countries. It comes from the phrase "Subscriber Trunk Dialling."
A 5-digit STD code is simply an area code in the UK that has 5 digits. The 0 is not included as a part of the area code. The 0 is dialled within the UK to signify a long-distance call. The 0 is not dialled on a call from abroad.
There are only 12 such area codes.
013873 - Langholm 015242 - Hornby-with-Farleton 015394 - Hawkshead 015395 - Grange-over-Sands 015396 - Sedbergh 016973 - Wigton 016974 - Raughton Head 016977 - Brampton 017683 - Appleby-in-Westmorland 017684 - Pooley Bridge 017687 - Keswick 019467 - Gosforth
Note that India also uses the term "STD Code" for its domestic telephone area codes, and India has many STD codes that are 5 digits or longer.
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It could be any of 100,000 combinations.
What is the sum of greatest 3-digit 4-digit 5digit
In the UK, 0140 is an incomplete STD code (telephone area code); you need one more digit. In India, 0140 is an invalid STD code.
900
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STD code for France is 0033
I'm guessing that you mean STD = Subscriber Trunk Dialling (telephone area code) rather than STD = Sexually Transmitted Disease. STD code is another term used in some country for telephone area codes. The purpose of a telephone area code is to group telephone numbers by geographic area. In many cases, at least some calls to numbers with the same STD code as the caller can be dialed without the STD code, allowing shorter dialing sequences for many local calls.
01409 area code Holsworthy
The std code starts with 022
01234245
01224246