How many different signals can be made by flags from flags of different colors?
Find the number of different signals :
Here we have to arrange flags taken flags at a time which is equivalent to filling flags placed out of flags. For that, we have the formula of permutation:
.
Number of different signals made by flags from different colored flags
Therefore the required number of signals can be made by flags from flags of different colors is .
Hence, the correct option is B.