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
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
What is the difference between the sixth and the fifth terms of the sequence...
This topic has expert replies
-
BTGmoderatorLU
- 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
