Question

Going to send you a picture of the question

Answer 1

The general expression for the possible number of arrangements of n distinct elements is n!

In the given question,

There is 6 six letter keypad with letters : A, B, C, D, E and F

i.e total number of elements = 6

Since all the letters are different

Thus, the number of arrangements of 6 letters = 6 !

`\begin{gathered} 6!\text{ = 6}*5*4*3*2*1 \\ 6!\text{ =720} \end{gathered}`

Possible number of codes = 720

Answer : 720