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

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 350,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

I have a vague idea about this and took a guess and got it [#permalink]
06 Nov 2006, 07:03

00:00

A

B

C

D

E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct
0% (00:00) wrong based on 1 sessions

I have a vague idea about this and took a guess and got it right. But I'd like to see some other explanations

I basically thought of since its exponent is an odd number, its last digit will always be odd and then tried seeing a pattern and picked 7 coz if you multiple it 7 times, gets you last digit 7......

3^1 = 3, 3^2 = 9, 3^3 = 27, 3^4 = 81, 3^5 = 243 and now the ones digit starts repeating. [edit original answer to make more clear]

so the sequence is {3,9,7,1,3,9,7,1,3,9,7,1, ....} so we merely have to find the 987th one in the series. Apparently, each fourth term is a 1 (so term 8 is 1, term 12 is 1, etc..). That means term 984 is a 1, term 985 is a 3, term 986 is a 9, and term 987 is a 7.

powers of3 go in seq of 1,3,9,7...
follow it..u get 7

quote="uvs_mba"]I have a vague idea about this and took a guess and got it right. But I'd like to see some other explanations

I basically thought of since its exponent is an odd number, its last digit will always be odd and then tried seeing a pattern and picked 7 coz if you multiple it 7 times, gets you last digit 7......

How the growth of emerging markets will strain global finance : Emerging economies need access to capital (i.e., finance) in order to fund the projects necessary for...

Good news for globetrotting MBAs: travel can make you a better leader. A recent article I read espoused the benefits of traveling from a managerial perspective, stating that it...