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  • How many different signals can be generated using 10 different colored flags if a signal requires the use of two flags, one below the other?  <s

How many different signals can be generated using 10 different colored flags if a signal requires the use of two flags, one below the other?

 

Option: 1

30


Option: 2

10


Option: 3

50


Option: 4

90


Answers (1)

best_answer

We need to select two flags.

The number of ways to choose the first flag is 10.

We cannot select the same color flag after selecting the first one.

9 ways to select the second flag.

Since we must select two flags, we must multiply 10 and 9 to get 90.

So the total number of ways to choose two flags is 90.

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Sayak

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