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.
Apr 25Crafting an Impactful Resume: Balancing Detail with Brevity
10:00 AM EDT
-10:30 AM EDT
Showcase your achievements through impactful storytelling! Get ready for an LIVE session on April 25, Learn how to craft compelling narratives on your resume that resonate with admission committees.
Apr 26Get a Top GRE Score with Target Test Prep
12:00 PM EDT
-01:00 PM EDT
The Target Test Prep course represents a quantum leap forward in GRE preparation, a radical reinterpretation of the way that students should study. In fact, more and more Target Test Prep students are scoring 329 and above on the GRE.
Consider a series of 300 numbers in which the first number..
[#permalink]
29 Oct 2020, 22:38
29 Oct 2020, 22:38
1
1
Bookmarks
00:00
Question Stats:
66% (01:37) correct
33% (01:35) wrong based on 45 sessions
Hide Show timer Statistics
Consider a series of 300 numbers in which the first number is 3 and the second number is 5, and each succeeding number is equal to the sum of the previous two numbers in the series. If a number is randomly selected from the series, what is the probability that the number selected will be odd?
A. 1/3
B. 1/2
C. 2/3
D. 3/4
E. 4/5
A. 1/3
B. 1/2
C. 2/3
D. 3/4
E. 4/5
Re: Consider a series of 300 numbers in which the first number..
[#permalink]
30 Oct 2020, 02:17
30 Oct 2020, 02:17
1
The series will look like this
3,5,8,13,21,34,55,89,144,233,377,600
Looking at the series above
Even number appear one in every three
Hence ans is 1/3 A
Posted from my mobile device
3,5,8,13,21,34,55,89,144,233,377,600
Looking at the series above
Even number appear one in every three
Hence ans is 1/3 A
Posted from my mobile device
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: Consider a series of 300 numbers in which the first number..
[#permalink]
30 Oct 2020, 06:03
30 Oct 2020, 06:03
2
bunterocks wrote:
Consider a series of 300 numbers in which the first number is 3 and the second number is 5, and each succeeding number is equal to the sum of the previous two numbers in the series. If a number is randomly selected from the series, what is the probability that the number selected will be odd?
A. 1/3
B. 1/2
C. 2/3
D. 3/4
E. 4/5
A. 1/3
B. 1/2
C. 2/3
D. 3/4
E. 4/5
As always, let's list a few terms in the series.
However, since all we care about is EVEN and ODD, we'll replace 3 with ODD and replace 5 with ODD
We get:
term1 = 3 = ODD
term2 = 5 = ODD
term3 = ODD + ODD = EVEN
term4 = EVEN + ODD = ODD
term5 = ODD + EVEN = ODD
term6 = ODD + ODD = EVEN
term7 = EVEN + ODD = ODD
term8 = ODD + EVEN = ODD
term9 = ODD + ODD = EVEN
We can see that the pattern ODD - ODD - EVEN repeats every three terms.
So, P(ODD) = 2/3
Answer: C
Cheers,
Brent
