GMAT Past Paper Test - Probability - The Beat The GMAT Forum - Expert GMAT Help & MBA Admissions Advice

If a 3 digit integer is selected at random from the integers 100 through 199, inclusive, what is the probability that the first digit and the last digit of the integer are each equal to one more than the middle digit?

a. 2/225
b. 1/111
c. 1/110
d. 1/100
e. 1/50

oa is d...but how?

Quote

raulverde: Senior | Next Rank: 100 Posts; Posts: 91; Joined: Wed May 16, 2007 5:46 am; Thanked: 2 times

by raulverde » Thu Sep 27, 2007 4:51 pm

Nisha,

The 100th digit can only be 1 . So the Units also has to be 1

The only possibility is : 101

Hence 1/100

Quote

kajcha: Master | Next Rank: 500 Posts; Posts: 321; Joined: Tue Aug 28, 2007 5:42 am; Thanked: 1 times

by kajcha » Thu Sep 27, 2007 6:12 pm

Agree D.

Quote

Post new topic Post Reply

• Page 1 of 1

5/5

5 Star (473 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