Given 5 flags of different colours, how many different signals ca… - Vidyadip

Question

Given 5 flags of different colours, how many different signals can be generated, if each signal requires the use of 2 flags, one below the other?

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Answer

Here the upper place of the flag can be fil1ed in 5 ways by using the 5 flags of different colours. Now the lower place of the flag can be filled in 4 ways by using the remaining 4 flags of different colours.
$\therefore $ Total numbers of signals $ = 4 \times 5 = 20$

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