Re: GMAT question - symantic problem?
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the question could mean "how many different possible entries exist in which it's not the case that all three digits are equal?"
like 001. you could say "are all three digits equal? no. therefore, all three digits are not equal."
in this case, you get 990.
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obv a lot of v smart people are disagreeing here, but this is, imo, the correct way to look at it.
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