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.htmlRegards