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How many different ways can you select a pilot and...

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by swerve » Tue Dec 26, 2017 2:57 pm
How many different ways can you select a pilotn and a co pilot if you have 100 people to choose from?

(A) 199
(B) 200
(C) 398
(D) 4950
(E) 9900

The OA is E.

Please, can any expert explain this PS question for me? I tried to solve it but I can't get the correct answer. I need your help. Thanks.
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by elias.latour.apex » Wed Dec 27, 2017 4:41 am
If you have 100 people to choose from, and you want to select a pilot, then there are 100 different people you can choose.
Once you have selected the pilot, you now have 99 people to choose from for the co-pilot.

Accordingly, there are 99 x 100 = 9900 different combinations of pilot and co-pilot possible.
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by Scott@TargetTestPrep » Wed Sep 04, 2019 5:21 pm
swerve wrote:How many different ways can you select a pilotn and a co pilot if you have 100 people to choose from?

(A) 199
(B) 200
(C) 398
(D) 4950
(E) 9900

The OA is E.

Please, can any expert explain this PS question for me? I tried to solve it but I can't get the correct answer. I need your help. Thanks.
The number of ways to select a pilot of co-pilot is 100P2 = 100 x 99 = 9900.

Answer: E

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