Question

There are 7 flags of different colour. Find the number of different signals that can be transmitted by the use of 2 flags one above the other.​

Answer 1

Answer:

42

Step by step explanation:

Given:

Total no. of flags=7

Total no. of signals with two flag combination

=7C2

=7*6/1*2

=42/2

=21

One flag is below to other.

So, single combination can also be interchanged.

So, total no. of signals = 2*21

= 42

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