BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

130-point score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

he sequence An satisfies An = An-1An-2, where n is a positiv

Expert replies
by Max@Math Revolution » Thu Jun 06, 2019 4:50 pm

Timer

00:00

Answers

A

B

C

D

E

Stats

Difficulty

[GMAT math practice question]

The sequence An satisfies An = An-1/An-2, where n is a positive integer greater than 2. If A1=1 and A2=2, then A123=?

A. 1/2
B. 1/4
C. 1
D. 2
E. 4
Join the discussion
Source: — Problem Solving |

by Max@Math Revolution » Sun Jun 09, 2019 5:10 pm
=>

A1 = 1
A2 = 2
A3 = A2/A1 = 2/1 =2
A4 = A3/A2 = 2/2 =1
A5 = A4/A3 = 1/2
A6 = A5/A4 = (1/2)/1 = 1/2
A7 = A6/A5 = (1/2)/(1/2) =1
A8 = A7/A8 = 1/(1/2) = 2
Since A7 = 1 and A8 = 2, the sequence is periodic with period 6.
Thus, A123 = A3 = 2 since 123=6·20+3

Therefore, the answer is D.
Answer: D
Join the discussion