Given 7 flags of different colours, how many different signals can be generated if each signal requires the use of two flags, One below the other ?
First place can be filled up in seven ways. After filling first place , we have left with 6 flags.
Therefore The second place can be filled up in six ways...
The total number of signals which can be generated = 7 x 6 ways = 42 ways..........
Sol :
First place can be filled up in seven ways. After filling first place , we have left with 6 flags.
Therefore The second place can be filled up in six ways...
The total number of signals which can be generated = 7 x 6 ways = 42 ways..........
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