Apassword is 4 characters long and must consist of 3 letters and one number. if letters cannot be repeated and the password must end with a number, how many possibilities are there? a. 175,760 b. 158,184 c. 156,000 d. 140,400

c. 156,000

Step-by-step explanation:

Given: A password is 4 characters long and must consist of 3 letters and one number.

We know that total number of letters = 26

Number of digits = 10

If letters cannot be repeated and the password must end with a number, then to find the number of possibilities we need to use Permutations for letters.

Thus, the number of possibilities are given by :

28

step-by-step explanation:

because that's the answer