could be x³?

A

Option A: 1.25*10^17

125*10^15=x^3-->x=5*10^5

Option B and C rule out as they are not integer.[Since x is an integer,x^3 also is an integer]

Pick A

@outreach and selango

Please let us also know how you pick an answer choice, may be in very epigrammatic mode. This would bring about a discussion if contradictions were there in concepts rather than in an answer choice and that would be helpful to the less active users of this site at large.

selango wrote:Option A: 1.25*10^17

125*10^15=x^3-->x=5*10^5

Option B and C rule out as they are not integer.[Since x is an integer,x^3 also is an integer]

Pick A

0.125*10^-12 = 125*10^-15
X = (5 * 10^-5)^3 = 125 *10^-15
Pick D

sanju09 wrote:If x is an integer, which of the following could be x³?
I. 1.25 x 10^17
II. 12.5 x 10^-12
III. 0.125 x 10^-12
A. I only
B. II only
C. I and II only
D. I and III only
E. II and III only

[spoiler]Source: majortests.com[/spoiler]

1.X ^3 = 1.25 x 10^17 = 125 X 10^15

X = 5 X 10 ^3 -- Integer

II .X ^3 =12.5 x 10^-12 = 12.5/ 10^12
=125/10^13

X= 5 / 10 ^(13/3) --- NOT a integer.

III. X ^3 =0.125 x 10^-12 = 0.125/10^12
125/10^15
X= 5/10^5 -- NOT a integer.

Pick A