Seven people go to a cinema and park their car outside,which are identical.while returning only three of them were able to unlock their cars.find total no. of ways in which this can be done

Question

Vijay Mukati · Answer

This will be equal to selecting 3 out of 7 people and then rearrange them but subtracting one case for which the cars will be unlock. 7P3 -1.

mahein · Answer

choose 3 out of 7 and dearrange rest 4 because only three of them are right so answer will be 7C3*D9=7*5*9=315

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Seven people go to a cinema and park their car outside,which are identical.while returning only three of them were able to unlock their cars.find total no. of ways in which this can be done

Seven people go to a cinema and park their car outside,which are identical.while returning only three of them were able to unlock their cars.find total no. of ways in which this can be done

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Seven people go to a cinema and park their car outside,which are identical.while returning only three of them were able to unlock their cars.find total no. of ways in which this can be done

Seven people go to a cinema and park their car outside,which are identical.while returning only three of them were able to unlock their cars.find total no. of ways in which this can be done

2 Answers

Think You Can Provide A Better Answer ?

Other Related Questions on Algebra

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