Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Jun 0808:00 PM EDT
-10:00 PM EDT
Master the GMAT with expert live instruction, a personalized study plan, and real-time support. Includes 40 hours of online classes plus 6 months of access to the TTP GMAT OnDemand video course. Mon/Wed June 8, 2026 →August 12, 2026 8:00pm-10:00pm EST
Jun 1006:00 AM PDT
-06:15 PM PDT
Register for the GMAT Club Virtual MBA Spotlight Fair – the world’s premier event for serious MBA candidates. This is your chance to hear directly from Admissions Directors at nearly every Top 30 MBA program..- Jun 10
10:00 AM PDT
-11:00 AM PDT
Scoring 715 on the GMAT Focus Edition requires more than just learning formulas, memorizing concepts, or solving hundreds of questions. In this episode, Nishant shares how he improved his GMAT preparation by focusing on application of concepts, and more. 
Jun 1111:00 AM EDT
-01:00 PM EDT
TTP GMAT OnDemand gives serious students 400+ hours of expert video instruction, the full TTP course, AI support, weekly office hours, and a 715+ score guarantee—all built for elite GMAT score improvement.
07 Jun 2026, 08:49
Kudos
Bookmarks
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
0% (00:00) correct
0%
(00:00)
wrong
based on 0
sessions
History
Date
Time
Result
Not Attempted Yet
- AP Shortcut GMAT Loves
t10 + t11 + ... + t18
Use:
(Sum first 18) − (Sum first 9)
Very common technique.
- Consecutive Integers
1,2,3,4,5,...
Difference = 1
Sum of First n Integers
Must know:
1+2+3+⋯+n = n(n+1)/2
- Sum of Consecutive Even Integers
2,4,6,8,...
If there are n terms:
Sum = n(n+1)
- Sum of Consecutive Odd Integers
1,3,5,7,...
If there are n terms:
Sum = n2
Must Memorize
1 = 12
1+3 = 22
1+3+5 = 32
1+3+5+7 = 42
Very common GMAT pattern.
- Alternating Sign Sequences
Example:
1/2 − 1/4 + 1/8 − 1/16 + ...
Notice:
Signs alternate
Terms shrink
GMAT Trick
Group terms.
(1/2 − 1/4) + (1/8 − 1/16) + ⋯
Every bracket is positive.
This helps estimate ranges quickly.
Whenever you see:
a−b+c−d+e−f+⋯
and
signs alternate
magnitudes get smaller
don't calculate the sum.
Instead:
Pair terms.
Create a lower bound.
Create an upper bound.
Find the range.
This is the real concept being tested, not GP formulas. The question is testing estimation and bounding of alternating sequences.
- AM, GM and HM
Three important means.
Arithmetic Mean (AM)
AM = (a+b)/2
Geometric Mean (GM)
GM = √(ab)
Harmonic Mean (HM)
HM = 2ab/(a+b)
Golden Inequality
For all positive numbers:
AM ≥ GM ≥ HM
Must memorize.
Example
a = 50
b = 2
AM:
(50+2)/2
= 26
GM:
√100
= 10
HM:
(2×50×2)/(50+2)
= 200/52
≈ 3.85
Therefore
26 > 10 > 3.85
Special Identity
For two positive numbers:
AM × HM = GM2
Equivalent form:
[(a+b)/2] × [2ab/(a+b)] = ab = (√ab)2
Note:
AM × HM = GM2
NOT
AM × HM = GM
Very common GMAT property.
Moderator:
