It is currently 25 Sep 2017, 01:16

### 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

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

Track

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# M10 #36

Author Message
Forum Moderator
Status: mission completed!
Joined: 02 Jul 2009
Posts: 1395

Kudos [?]: 937 [0], given: 621

GPA: 3.77

### Show Tags

19 Sep 2010, 09:44
This question seems odd a little bit.

We have a range of figures expressed $$(10^n-1)^n$$, where we are given first three elements n=1, n=2, n=3.
Then I am asked what is the last digit of given range of figures.
in 2) it is mentioned that n is prime, I know that all primes are odd except for 2. But I see that n=2 is in range and a set $$(10^n-1)^n$$ has already n=1, n=2, n=3, so last figure can not contain $$(10^2-1)^2$$. Additional n=2 misleads.

Don't you think that for clarity we must add something like " n can be any number" or something like this.
_________________

Audaces fortuna juvat!

GMAT Club Premium Membership - big benefits and savings

Kudos [?]: 937 [0], given: 621

Intern
Status: yet to apply
Joined: 05 Jun 2010
Posts: 17

Kudos [?]: 5 [0], given: 10

### Show Tags

23 Sep 2010, 11:08
This question seems odd a little bit.

We have a range of figures expressed , where we are given first three elements n=1, n=2, n=3.
Then I am asked what is the last digit of given range of figures.
in 2) it is mentioned that n is prime, I know that all primes are odd except for 2. But I see that n=2 is in range and a set has already n=1, n=2, n=3, so last figure can not contain . Additional n=2 misleads.

Don't you think that for clarity we must add something like " n can be any number" or something like this

Here are my 2 cents-
A Range is given..and first 3 elements of the range also you can find out (given n1=1 n2=2 n3=3).So at least the range has 3 elements, otherwise if the range is bigger, for other elements of the range, n is a prime no and that is bigger than 3.

now $$(10^n-1= has 9 at the units place always$$. So $$9^(any odd prime digit)$$ will have 1 at its units place..hope i made sense

Kudos [?]: 5 [0], given: 10

Re: M10 #36   [#permalink] 23 Sep 2010, 11:08
Display posts from previous: Sort by

# M10 #36

Moderator: Bunuel

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.