A problem is given below. Instead of trying to solve that​ problem, state a simpler problem and solve it instead.   A car comes with nine options. You may buy the car with any combination of these options​ (including none). How many different choices do you​ have?       Which of the following is a simpler version of the given​ problem?     A. A car comes with three options. You may buy the car with any combination of these options​ (including none). How many different choices do you​ have?   B. A car comes with nine options. You may buy the car with any combination of these​ options, but it must include at least two of the options. How many different choices do you​ have?   C. A car comes with three options. In how many ways can you choose exactly one of​ them?   D. A car comes with nine options. In how many ways can you choose exactly four of​ them?

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