6. A lead role and a supporting role are to be chosen from a drama club consisting of 40 talents. How many various choices of actors are possible if: (1) there are no restrictions? (ii) actor Kristoff will participate only if he is the lead role? (ii) actors Jess and Jet will act together or not at all? (iv) actors Keanne and Gian will not act together?

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A: Introduction :

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