Given 7 flags of different colours, how many different signals ca… - Vidyadip

Question

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?

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Answer

Since there are 7 flags of different colours, therefore, first flag can be selected in 7 ways.
Now, the second flag can be selected from any one of the remaining flags in 6 ways.
Hence, by the fundamental principle of multiplication, the number of flag is 7 × 6 = 42

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