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There are 18 stationary bikes set up in 3 rows of 6 
6 friends reserve bike ( but can't reserve a specific bike) What are the odds (probability) that they will all be in a row together?

 Jun 2, 2020
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The person persons gets a bike; it doesn't matter which one.

For the second person to get a bike in the same row, there are 5 remaining in that row:  5/17

For the third person to get a bike in the same row, there are 4 reamining in that row:  4/16

 

Total probability:  1 x 5/17 x 4/16

 Jun 2, 2020

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