How many signals can be made using 6 different coloured flags when any number of them can be hoisted at a time?
A. 1956
B. 1720
C. 2020
D. 1822
Answer:A
How many signals can be made using 6 different coloured flags when any number of them can be hoisted at a time?
A. 1956 B. 1720 C. 2020 D. 1822