Source: GMAT Paper Tests
What is the difference between the sixth and the fifth terms of the sequence 2, 4, 7,. . . whose nth term is n+2^(n-1)?
A. 2
B. 3
C. 6
D. 16
E. 17
The OA is E
What is the difference between the sixth and the fifth terms of the sequence...
This topic has expert replies
-
- Moderator
- Posts: 2207
- Joined: Sun Oct 15, 2017 1:50 pm
- Followed by:6 members
Timer
00:00
Your Answer
A
B
C
D
E
Global Stats
GMAT/MBA Expert
- Scott@TargetTestPrep
- GMAT Instructor
- Posts: 7242
- Joined: Sat Apr 25, 2015 10:56 am
- Location: Los Angeles, CA
- Thanked: 43 times
- Followed by:29 members
Solution:BTGmoderatorLU wrote: ↑Thu Oct 22, 2020 8:53 amSource: GMAT Paper Tests
What is the difference between the sixth and the fifth terms of the sequence 2, 4, 7,. . . whose nth term is n+2^(n-1)?
A. 2
B. 3
C. 6
D. 16
E. 17
The OA is E
To find the sixth term, let's first substitute 6 for n.
6 + 2^(6-1)6 + 2^5
6 + 32 = 38
To find the fifth term, we substitute 5 for n.
5 + 2^(5-1)
5 + 2^4
5 + 16 = 21
The difference between the 6th and 5th terms of the sequence is 38 – 21 = 17.
Answer: E
Scott Woodbury-Stewart
Founder and CEO
[email protected]
See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews