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.
Let x1, x2, x3......xn be a sequence of positive numbers whe
[#permalink]
15 Apr 2018, 08:24
15 Apr 2018, 08:24
Expert Reply
2
Bookmarks
00:00
Question Stats:
81% (01:20) correct
18% (01:44) wrong based on 48 sessions
Hide Show timer Statistics
Let x1, x2, x3......xn be a sequence of positive numbers where X1 = 1, and Xn+1 = Xn + 4. What represents the nth term in the sequence?
A. -3n
B. 3n - 4
C. 4n - 3
D. 4n - 4
E. 5n
A. -3n
B. 3n - 4
C. 4n - 3
D. 4n - 4
E. 5n
Re: Let x1, x2, x3......xn be a sequence of positive numbers whe
[#permalink]
16 Apr 2018, 01:33
16 Apr 2018, 01:33
1
\(1\)st term \(= 1\) (given)
\(2\)nd term \(= 1 + 4 = 5\)
\(3\)rd term \(= 5 + 4 = 9\)
We have \(5\) ans choices each expression contains \(n\) which is the number of terms
Equating each expression with a term in our sequence should give us the ans
let us suppose 2nd term which is \(5\)
Among the ans choices whichever returns with a value for \(n = 2\) is the ans
option c does exactly that when \(4n -3 =5\)
or, \(4n = 8\) hence, \(n = 2\)
option c
\(2\)nd term \(= 1 + 4 = 5\)
\(3\)rd term \(= 5 + 4 = 9\)
We have \(5\) ans choices each expression contains \(n\) which is the number of terms
Equating each expression with a term in our sequence should give us the ans
let us suppose 2nd term which is \(5\)
Among the ans choices whichever returns with a value for \(n = 2\) is the ans
option c does exactly that when \(4n -3 =5\)
or, \(4n = 8\) hence, \(n = 2\)
option c
Re: Let x1, x2, x3......xn be a sequence of positive numbers whe
[#permalink]
31 May 2019, 06:51
31 May 2019, 06:51
1
Just a second thought:
Nth term= first term + ( N term - first term) difference between terms
So,Nth term = 1+ ( n-1)4 [ as the common difference is 4 ]
So, Nth term = 4n-3, Which is the same to the answer option C.
Is this correct approach ?
Nth term= first term + ( N term - first term) difference between terms
So,Nth term = 1+ ( n-1)4 [ as the common difference is 4 ]
So, Nth term = 4n-3, Which is the same to the answer option C.
Is this correct approach ?
