Problem 3Consider the following definitions for sets of
characters:•Digits ={0,1,2,3,4,5,6,7,8,9}•Letters ={a, b, c, d, e,
f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y,
z}•Special characters ={∗,&,$,#}Compute the number of passwords
that satisfy the given constraints
.(i) Strings of length 7. Characters can be special characters,
digits, or letters ,with no repeated characters
.(ii) Strings of length 6. Characters can be special characters,
digits, or letters ,with no repeated...