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A car is parked among 'N' cars in a row,...

A car is parked among 'N' cars in a row, not at either end. On his return, the owner finds that exactly 'r' of the 'N' places are still occupied. What is the probability that both neighbouring places are empty ?

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The correct Answer is:
`((N-r)(N-r-1))/((N-1)(N-2))`
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