Here is an interesting GMAT number property problem solving question. Concept tested : number of factors.

Integer x has n factors; 3x has 3 factors; Which of the following values can n take?

I. 1

II. 2

III. 3

A. I only

B. II only

C. I or II

D. II or III

E. I or III

Integer x has n factors; 3x has 3 factors; Which of the following values can n take?

I. 1

II. 2

III. 3

A. I only

B. II only

C. I or II

D. II or III

E. I or III

Labels: GMAT Number Properties, GMAT Number Theory, GMAT Numbers