A computer password is composed of seven characters. If each character must be a letter (A - Z), then how many different passwords can be constructed so that the password is the same both forwards and Backwards? (Note: Examples would be ETTFTTE or RACECAR.)
A) 245712
B) 358800
C) 456976
D) 5866254125
E) None of the above.

Question

Quizplus · Accepted Answer

A palindrome password of 7 characters has the form ABCDCBA. There are 26 choices for each of the first four characters (A, B, C, D), resulting in 26^4 = 456976 possible passwords.

A Computer Password Is Composed of Seven Characters