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Re: How many four-digit positive integers are there such that th [#permalink]
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econgre wrote:
The question should mention that the digits are non-repeating, shouldn't it?


The question is asking you HOWE many digit you can form using those 4 numbers . The fact you mentioned is not even implied. Thta is the fundamental counting principle

How the question is written, the repetition is out of scope.

\(4\)\(P_4 = 4*3*2*1=24\)

C is the answer

More on counting method from out GRE Math book https://gre.myprepclub.com/forum/gre-quant ... 18819.html

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