Letters and numbers only. No symbols, punctuation, or special characters.
IE
abcdefghijklmnopqrtsuvwxyz1234567890
Group1 is considered Alpha-Numeric because it has both alphabet characters and numeric characters.
They are all numeric characters, exactly as you have written it.
ruby
In Excel all columns default numeric characters to numbers.
00.9
It is the same as 350
The term alpha characters refers to those characters that are letters. This is in contrast with numeric characters, which are numbers.
9.00 is the same as 9
a digit (number) as opposed to a letter--
Exactly as you have done in the question: 45000
Without the leading zero: 9057606387
1975