GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
What is the greatest prime factor of (2^4)
[#permalink]
25 Mar 2019, 11:38
25 Mar 2019, 11:38
Expert Reply
00:00
Question Stats:
77% (00:39) correct
22% (00:15) wrong based on 9 sessions
Hide Show timer Statistics
What is the greatest prime factor of \((2^4)^2 - 1\)?
(A) 3
(B) 5
(C) 11
(D) 17
(E) 19
(A) 3
(B) 5
(C) 11
(D) 17
(E) 19
Re: What is the greatest prime factor of (2^4)
[#permalink]
27 Mar 2019, 23:51
27 Mar 2019, 23:51
1
\(2^8 = 256 - 1 = 255\)
we know, any number ending with 5 or 0 is divisible by 5.
Hence, we know option A cannot be the ans.
Among, 11, 17 and 19 only 17 divides into 255 so it is the ans.
we know, any number ending with 5 or 0 is divisible by 5.
Hence, we know option A cannot be the ans.
Among, 11, 17 and 19 only 17 divides into 255 so it is the ans.
gmatclubot
Re: What is the greatest prime factor of (2^4) [#permalink]
27 Mar 2019, 23:51
Moderators:
