Precisa-se construir um retângulo de 720 m2 de área. Se as medidas a e b de seus lados, em metros, devem ser números inteiros com a propriedade MDC(a,115)=1, a quantidade de retângulos que poderão ser construídos com esses dados é:

Google intentionally circumvented the default privacy settings of Apple’s Safari browser, using a backdoor to set cookies on browsers set to reject them, in the latest privacy debacle for the search and advertising giant.

Google immediately disabled the practice after the Wall Street Journal disclosed the practice Thursday night, which was discovered by Stanford researcher Jonathan Mayer and confirmed by security consultant Ashkan Soltani.

Safari, which accounts for about 6% of desktop browsing and more than 50% of mobile browsing, is the only major browser to block so called third-party cookies by default. When you visit a website, all browsers, including Safari, allow that site to put a small tracking file on your computer, which allows the site to identify a unique user, track what they’ve done and remember settings. However, many sites also have Facebook “Like” buttons, ads served by third parties, weather widgets powered by other sites or comment systems run by a third party.

Safari blocks the sites that power those services from setting or reading cookies, so a Facebook widget on a third-party site, for instance, can’t tell if you are logged in, so it can’t load a personalized widget. Google, along with a number of ad servers, were caught by Mayer avoiding this block, using a loophole in Safari that lets third parties set cookies if the browser thinks you are filling out an online form.

Google said it used the backdoor so that it could place +1 buttons on ads it places around the web via its Adsense program, so that logged-in Google+ users could press the button to share an ad. Without the workaround, the button wouldn’t be able to tell Google which Google account to link the button to.