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A car is parked among N cars standing i...

A car is parked among `N` cars standing in a row, but not at either end. On his return, the owner finds that exactly `"r"` of the `N` places are still occupied. The probability that the places neighboring his car are empty is a.`((r-1)!)/((N-1)!)` b. `((r-1)!(N-r)!)/((N-1)!)` c. `((N-r)(N-r-1))/((N-1)(N+2))` d. `"^((N-r)C_2)/(.^(N-1)C_2)`

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