duongthang wrote:I do not understand. I thing correct answer is A.
think that we fill 6 choice in 4 slot as princeton review did. so, we have 6x5x4x3 choice.
but in this, ORDER DOSE NOT MATTER, because whether the family order ABCD or BADC is the same.
so 6x5x4x3/4! =15
pls, help if I make mistake
ah, ok, i see what you mean.
in fact, the wording of the problem is ambiguous. it's not clear which of the following is the case:
* each member of the family orders a plate individually (in which case order matters); or
* the family orders four plates communally (in which case order doesn't matter).
i assumed that the former is the case, primarily because of the wording "nobody orders the same meal". i took those words to mean that each member of the family individually ordered a plate, so that order matters (i.e., if the same 4 plates are ordered, but by different people, then that's a different outcome).
i can see, though, how you would have interpreted it the other way.
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rest assured that
official problems will not have this degree of ambiguity in their problem statements.
Ron has been teaching various standardized tests for 20 years.
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