Assume that 10 people, including the husband and wife pair, apply for 4 sales positions. people are hired at random.. what is the probability that one is hired and one is not?

Umm.. just started this 2day and its not on my notes(p′︵‵。)

Afactory adds 3 red drops and 2 blue drops of coloring to white paint to make each pint of purple paint. the factory will make 50 gallons of the purple paint.how many drops of red and blue coloring will the factory need in the 50 gallon batch of purple paint.

Ithink i know it but i want to be sure so can you me out ?