exponents

Expert replies

tj123: Senior | Next Rank: 100 Posts; Posts: 85; Joined: Mon Dec 08, 2008 12:09 am

by tj123 » Fri Dec 26, 2008 1:29 am

The Value of (10^8 - 10^2) / (10^7-10^3) is closet to which of the following?

A) 1
B) 10
C) 10^2
D) 10^3
E) 10^4

Answer is B

Please expalin how to get to answer

Like this post

Source: Beat The GMAT — Problem Solving | Fri Dec 26, 2008 1:29 am

vishubn: Legendary Member; Posts: 574; Joined: Sun Jun 01, 2008 8:48 am; Location: Bangalore; Thanked: 28 times

by vishubn » Fri Dec 26, 2008 2:00 am

its discused before !!

neverthless !!

u take 10^2 common factor in numerator

10^3 in deno

cancels and ignore -1 !!

and u get 10^6/10^5=10 is the answer

vishu

KILL !! DIE !! or BEAT my FEAR !!! de@D END!!

Like this post

tj123: Senior | Next Rank: 100 Posts; Posts: 85; Joined: Mon Dec 08, 2008 12:09 am

by tj123 » Fri Dec 26, 2008 7:35 pm

10^7 - 10^3

Take out 10^3

10^3(10^4- 1)

so numerator on top of denom you get:

10^6/10^4

which would be 10^2

right?

Like this post

vishubn: Legendary Member; Posts: 574; Joined: Sun Jun 01, 2008 8:48 am; Location: Bangalore; Thanked: 28 times

by vishubn » Fri Dec 26, 2008 7:40 pm

10^2(10^6-1) is the numerator

10^3(10^4-1)

so 10^2 cancels out in numerator

and numerator is 10^6

but numerator we have 10 left, and after ignoring -1 we have 10^5 in denominator

10^6/10^5

OA 10

vishu

KILL !! DIE !! or BEAT my FEAR !!! de@D END!!

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review