Question 1191625
.
How many different signals consisting of five symbols or less can be sent 
using the dot and dash of Morse code?
~~~~~~~~~~~~~~~~


<pre>
The number of different signals using precisely n symbols 
(dot or dash of Morse code) is  {{{2^n}}},  n= 1, 2, 4, . . . 


Therefore, the answer to the problem's question is


    N(signals) = {{{2^1}}} + {{{2^2}}} + {{{2^3}}} + {{{2^4}}} + {{{2^5}}} = 2 + 4 + 8 + 16 + 32 = 62.    <U>ANSWER</U>
</pre>

Solved.



/////////////



The &nbsp;" 1 " &nbsp;in the formula by &nbsp;Alan corresponds to the empty word &nbsp;(= empty signal)


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;despite Alan's statement that he does not use empty signal.



I do not consider the empty word &nbsp;(empty signal) &nbsp;as a real signal and do not count it;


therefore, &nbsp;my answer is one unit less than the answer given by Alan.