GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 12 Nov 2018, 14:33

### GMAT 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

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

## Events & Promotions

###### Events & Promotions in November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
• ### Essential GMAT Time-Management Hacks

November 14, 2018

November 14, 2018

08:00 PM MST

09:00 PM MST

Join the webinar and learn time-management tactics that will guarantee you answer all questions, in all sections, on time. Save your spot today! Nov. 14th at 7 PM PST

# Let x1, x2, x3......xn be a sequence of positive numbers where X1 = 1,

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 50544
Let x1, x2, x3......xn be a sequence of positive numbers where X1 = 1,  [#permalink]

### Show Tags

03 Jul 2018, 08:52
00:00

Difficulty:

35% (medium)

Question Stats:

74% (01:31) correct 26% (03:02) wrong based on 31 sessions

### HideShow timer Statistics

Let $$x_1$$, $$x_2$$, $$x_3$$, ..., $$x_n$$ be a sequence of positive numbers where $$x_1 = 1$$, and $$x_{n+1} = x_n + 4$$. What represents the $$n_{th}$$ term in the sequence?

A. -3n

B. 3n - 4

C. 4n - 3

D. 4n - 4

E. 5n

_________________
Manager
Joined: 09 Jun 2018
Posts: 100
Location: United States (IN)
GPA: 3.95
WE: Engineering (Transportation)
Re: Let x1, x2, x3......xn be a sequence of positive numbers where X1 = 1,  [#permalink]

### Show Tags

03 Jul 2018, 08:58
Substitute n = 1 in options. Only Option C works.
_________________

If you found this relevant and useful, please Smash that Kudos button!

Manager
Joined: 14 Jun 2018
Posts: 179
Re: Let x1, x2, x3......xn be a sequence of positive numbers where X1 = 1,  [#permalink]

### Show Tags

03 Jul 2018, 09:26
1st term is 1 , 2nd is 5 , 3rd is 9...series with difference 4.
a+(n-1)d = 1 + (n-1)4 = 4n-3
Manager
Joined: 01 Feb 2017
Posts: 163
Re: Let x1, x2, x3......xn be a sequence of positive numbers where X1 = 1,  [#permalink]

### Show Tags

05 Jul 2018, 02:20
X1 = 1
X2 = X1 + 4 = 5= 1 + 4(2-1)
X3 = X2 + 4 = 9= 1 + 4(3-1)
X4 = X3 + 4 =13= 1 + 4(4-1)
Xn = 1 + 4(n-1) = 4n - 3

Hence, Ans C

Posted from my mobile device
Re: Let x1, x2, x3......xn be a sequence of positive numbers where X1 = 1, &nbs [#permalink] 05 Jul 2018, 02:20
Display posts from previous: Sort by