If -25

Question

If -25 < j < 25, is j > 0 ?

(1) j^2 = j
(2) j^3 = j

Bunuel · Answer

It's easy to spot that both 0 and 1 satisfy all conditions, giving different answers to the question.

Answer: E.

pushpitkc · Answer

(1) j^2 = j 
j^2 - j = 0
j(j - 1) = 0
This will give two values for j(0,1) Hence, insufficient.

(2) j^3 = j 
j^3 - j = 0
j(j^2 - 1) = 0
This will give three values for j(-1,0,1) Hence, insufficient

On combining both these statements, we cannot arrive at a unique answer for j, since j could be 0 or 1 (Option E)

Heseraj · Answer

In both option, though this question should have come up with DS question instead of PS,

1 and -1 works for both options, therefore, the response is E

If -25 < j < 25, is j > 0 ?