## Wednesday, February 15, 2012

### egads! the hairy GRE problem

Here's a nasty-looking GRE-style math problem:

Last night, Dave and Kathy both arrived at Pizza Palace at two different random times between 10:00 p.m. and midnight. They had agreed to wait exactly 15 minutes for each other to arrive before leaving. What is the probability that Dave and Kathy were together at Pizza Palace last night between 10:00 p.m. and midnight?

Problem (with solution by commenters) found here. I've never seen a problem like that in either my GRE materials or the GREs I've taken, so I can't vouch for how realistically GRE-ish the problem is. All I know is that the problem is intimidating.

_

All comments are subject to approval before they are published, so they will not appear immediately. Comments should be civil, relevant, and substantive. Anonymous comments are not allowed and will be unceremoniously deleted. For more on my comments policy, please see this entry on my other blog.

AND A NEW RULE (per this post): comments critical of Trump's lying must include criticism of Biden's lying on a one-for-one basis! Failure to be balanced means your comment will not be published.