Question 1159815
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The three cars hold a total of 11 people;  since there are 10 people, there will be one empty seat in one of the three cars.  There are 3 possibilities:
1, 4, 5
2, 3, 5
2, 4, 4<br>
If you wanted a solution with distinguishable people, instead of just numbers of people in each car, re-post the question saying so.  That is a far more complicated problem....<br>