Given 7 flags of different colours, how many different signals can be generated if a signal requires the use of two flags, one below the other?

Answers (1)

 arrange 7 flage taken 2 at a time 
so as there are only two flags be arranged with 7 different colors so the first flag can be arranged in any 7 ways and as for the second flag we have only 6 flag left(as 1 flag is already used) so it can be arranged in 6 ways

 so total  7 × 6 = 42 ways it can be arranged

 

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