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 Please help me 
When buying a new car, you have a choice of 4 different models, 3 different colors, and either compact or family size. How many choices are there for one car?  
5
12
16
24


17.   
There are 20 entries in the chess tournament. How many ways can they finish in first, second, and third place? 
340
6,840
7,220
8,350


Sagot :

[tex]1)\\4\ different\ models,\ 3\ different\ colors\ and\ 2\ sizes\\\\4\cdot3\cdot2=24\ (choices)\\\\17.\\20\ entries\ in\ the\ chess\ tournam.\\\\20-the\ number\ of\ ways\ to\ select\ 1.\ places\\19-the\ number\ of\ ways\ to\ select\ 2.\ places\\18-the\ number\ of\ ways\ to\ select\ 3.\ places\\\\\ the\ number\ of\ ways\ to\ select\ the\ top\ three=20\cdot19\cdot18=6,840[/tex]