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A train has 10 cars numbered 1 through 10. If the cars are coupled randomly, what is the probability that the first3 cars are in car number order?

Respuesta :

You would have a 3 to 10 chance that the first 3 cars are in order


Answer:

[tex]\frac{1}{720}[/tex]

Step-by-step explanation:

If we arrange the first three cars one by one we get -

Selecting the first car out of ten cars [tex]= \frac{1}{10}[/tex]

Selecting the second car out of remaining nine cars [tex]= \frac{1}{9}[/tex]

Selecting the third car out of remaining eight cars [tex]= \frac{1}{8}[/tex]

So, the probability of selecting  three cars back to back without repeating is given by

Probability of Selecting the first car out of ten cars * Probability of Selecting the second car out of  remaining nine cars * Probability of Selecting the third car out of  remaining eight cars

[tex]= \frac{1}{10} * \frac{1}{9}* \frac{1}{8}\\= \frac{1}{720}[/tex]

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