PRS PQRS Well both, most phones don't have a q, but some do
A standard telephone keypad uses letters from the alphabet. There are three letters on each keypad, except for the number one which is blank. For example, the number two has letters ABC. The number three has letters DEF and so on.
7 Digits in a Telephone Number
The number that is spelled with seven letters is "seventy."
The word "numbers" consists of 7 distinct letters. The number of permutations of these letters is calculated using the factorial of the number of letters, which is 7!. Therefore, the total number of permutations is 7! = 5,040.
In the English-speaking world, PQRS
The number of combinations of the letters TELEPHONE is 9 factorial, or 362,880. From that, however, we have to divide by 4 to account for the E being repeated twice, so the number of distinct combinations is 90,720.
The word "SCARLET" consists of 7 unique letters. To find the number of different arrangements, we calculate the factorial of the number of letters, which is 7!. Therefore, the total number of arrangements is 7! = 5,040.
7 = digits in a telephone number (not counting the area code)
On older telephone dials, there was no Q or Z. On more recent ones, Q was added to the 7 and Z was added to the 9.
The solution is count the number of letters in the word and divide by the number of permutations of the repeated letters; 7!/3! = 840.
That is not a valid telephone number. Telephone numbers do not contain letters, except in the form of vanity phonetic numbers (e.g. 1-800-DENTIST).
7 Digits in a Telephone Number