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# D01-20

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Math Expert
Joined: 02 Sep 2009
Posts: 51307

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28 Jun 2018, 19:33
UdithAshok wrote:
I think this is a poor-quality question and the explanation isn't clear enough, please elaborate. C! Is a prime number, it's given in question that a<b<c, since the only prime factorial is 2, c must be 2, and a is 0, b is 1. Please explain

This is explained MANY times on previous three pages. For (2) a and b can be any integers less than 2, not necessarily 0 and 1.
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Intern
Joined: 07 May 2018
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01 Aug 2018, 06:36
In terms of A and B and C not being a negative integer how do we rule that out?

Do we just assume because its undefined if it's a factorial that it can never be a negative integer and therefore a median can't exist with an undefined factorial? Does that mean we can only rule it out being negative in statement 1 and can't rule it out in statement 2?
Intern
Joined: 15 Jun 2018
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GMAT 1: 700 Q47 V38

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14 Aug 2018, 04:19
Once we have ascertained from Statement 2 that c! is 2! (i.e. c=2) => Can we not have a set where a! is 0!/ undefined (i.e. {a!, b!, c!} = {0!, 1!, 2!})?

Why is it that 0! cannot be a part of the set? What is the rule here? is it that a set must have defined numbers?
Re: D01-20 &nbs [#permalink] 14 Aug 2018, 04:19

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# D01-20

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