Question

There are 11 alphabets A, H, I, M, O, T, U, V, W, X, Y. They are called symmetrical
alphabets. The remaining alphabets are known as asymmetrical alphabets
How many four-lettered passwords can be formed by using symmetrical letters only? (repetitions not
allowed)
(1) 1086 (2) 255 (3) 7920 (4) None of these

Answer 1

There are 11 symmetrical alphabets and each
is unique. So we can create 11P4 passwords or 7920 passwords