The number of different signals which can be given from 6 flags of different colours taking one or more at a time, is
A. 1958
B. 1956
C. 16
D. 64
Answer:B
The number of different signals which can be given from 6 flags of different colours taking one or more at a time, is
A. 1958 B. 1956 C. 16 D. 64