Raju is a movie freak. Last Sunday, he watched five movie shows one after the other in his favorite multiplex. This multiplex has six screens, each screen showing a different movie. On each screen, a movie is repeated five times a day. If Raju watched exactly one movie twice and the other three movies only once, then in how many ways could he have watched the movie?
a. 6 x 5!/2!
b. 60 x 6!/2!
c. 6 x 6!/2!
d. 60 x 5!/2!
e. None of these
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