It is possibly the vowels: A I E O and U
It's the same reason that no letters in the English alphabet have a final form: it's just how the writing system evolved.
120.
One way to divide the alphabet into five groups is by using the concept of modular arithmetic. With the English alphabet having 26 letters, we can assign each letter a numerical value (A=0, B=1, ..., Z=25). We then divide these numerical values by 5 and group the letters based on the remainder. Group 1 would consist of letters with remainders of 0, Group 2 with remainders of 1, and so on until Group 5 with remainders of 4. This method ensures an equal distribution of letters across the five groups.
55 = 3125
130
There are 130
It is possibly the vowels: A I E O and U
It depends on how many letters are in the username and if double letters are allowed.
E, t, a, o, and i.
A B C D E
The letters j, k, w, x and y are letters that may be described as being in the English, but not the Italian, alphabet. The letters nevertheless do get used since they may be needed for foreign loan words, such as jazz, karaoke, walkie-talkie, xeres and yuppie. Their use introduces five consonants to an alphabet that traditionally preserves five vowels and 21 consonants.
Only one letter of the alphabet starts with t.
It's the same reason that no letters in the English alphabet have a final form: it's just how the writing system evolved.
B,C,D,F, and G
It is possibly the vowels: A I E O and U
120.