Question

A telegraph has ' $m$ ' arms and each arm is capable of ' $n$ ' distinct positions including the position of rest. The total number of signals that can be made is :

• A. ${}^m{P}_n$
• B. ${}^n{P}_m$
• C. $m^n-1$
• D. $n^m-1$

Answer 1

Answer: (D)

Correct answer is (d) $n^m-1$