We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!
Here is this week’s problem:
You have 1 minute (yes, only one minute!) to do this problem. Further, don’t do any long-hand math (multiplication, etc.)”shortcuts exist for every single calculation. Find them!
In how many ways can a four-letter password be chosen, using the letters A, B, C, D, E, and/or F, such that at least one letter is repeated within the password?
To see the answer choices, and to submit your answer, visit our Challenge Problem Showdown page on our site.
Discuss this week’s problem with like-minded GMAT takers on our Facebook page.