If s, u, and v are positive integers and , which of the following must be true? vus222+= I. s = u II. vu≠ III. s > v (A) None (B) Ι only (C) ΙI only (D) ΙII only (E) ΙΙ and ΙΙΙ OA is D Question should be If s, u, and v are positive integers and 2^s = 2^u + 2^v, which of the following must...

Prob with me too.

devesh99, I think the answer to your question is the term "MUST BE TRUE" in the question stem.

y = 1 could be true, not MUST BE TRUE.

E.g y can be 2
If x = 5, y = 2 --> (2 x 5 )/2 = 5: prime number greater than 2

I vote for A.

HTH.

Thanks Eric and team,
I'm gonna start self-studying GMAT this month. Your flashcards will certainly be helpful for me.
Thanks for your great work,