Level:
Project ID:
9000139707
Accepted:
1
Clonable:
0
Easy:
0
A Morse code utilized dots and dashes to encode letters of
an alphabet. Find the number of signals of the length from
\(1\) to
\(4\) which
can be obtained from dots and dashes.
\(2 + 2^{2} + 2^{3} + 2^{4}=30\)
\(1 + 2 + 3! + 4!=33\)
\(\frac{4!}
{3!\, 2!}=2\)
\(2 \cdot 1 + 2 \cdot 2 + 2 \cdot 3 + 2 \cdot 4=20\)