A telegraph has x arms each arm is capable of (x - 1) distinct positions ,including the positions - Maths - Permutations and Combinations

Question

A telegraph has x arms & each arm is capable of (x - 1)
distinct positions ,including the positions of rest The total no Of
signals that can be made:

Neha Sethi · Accepted Answer

Dear student

We know that each arm can be set in x-1 ways
So, x arms can be set in x-1× x-1× x-1× x-1× x-1 ways
But this includes the way when all the arms are in the position of rest,when no signal is sent
Hence required number of signals=x-1x-1
Regards

A telegraph has x arms & each arm is capable of (x - 1) distinct positions ,including the positions of rest .The total no. Of signals that can be made: