There are 12 vehicles in a parking lot, of which 3 are trucks and 9 are cars. How many possible selections of 4 vehicles from the parking lot contain at least one truck and at least one car?
There are 12 vehicles in a parking lot, of which 3 are trucks and 9 are cars. How many possible selections of 4 vehicles from the parking lot contain at least one truck and at least one car?