Assuming that it's purely random, let's consider where these people would probably be. Taking the percentage of the population each country represents, we get:
* China: 18.2% = 6.37 people
* India: 17.5% = 6.125 people
* America: 4.29% = 1.5 people
* Indonesia: 3.43% = 1.2 people
* Pakistan: 2.78% = 0.93 people
...etc. The percentage keeps going down. This means that roughly 6 people will be in China and India, each, and then the next 7 countries or so will probably have 1 survivor each (maybe 2 for America). The other 15-16 survivors would probably be found somewhere in the next 25-30 countries (as the probability of having any survivors approaches 50% or less).
So really, our most likely candidates for people meeting each other are China, India, and Europe (9.83% of the population as a whole for probably 3, maybe 4 survivors).
For India, 72.2% of the population lives in 641,000 rural villages, and this population is pretty evenly distributed, meaning 4-5 of our 6 survivors are probably located on a unique patch of 650-820 thousand square kilometers (3.2 million square kilometers divided by 4-5 people). This means they could walk for 800 kilometers in any direction, and never see each other.
The only real chance that they'd ever find each other would be if they all decided to go to the same major city. But which one to choose? There are 53 cities in India with over 1 million people, and at least 8 with more than 5 million. 998
Would someone in the populous region of Bihar go the 1300 km to Mumbai, the biggest city, or the 800 km to the capital of New Delhi? If you go to the wrong city, will you travel another several hundred km to a different city and hope your luck gets better? Most people are more likely to go to ground, either before any travel, or after failing to find someone after travelling once.
And even if two people, by chance, happen to go to the same city, it would be rather unlikely that they'd run into each other. Let's take Mumbai, for example. It has an area of 603 square km, which increases to almost 4400 square km including the metropolitan area. This means that two people would have to run into each other in an area that is roughly 25-70 km across and deep.
Chinese survivors have the advantage in that their population is concentrated in cities, but with a maximum metropolitan area holding only about 3% of the population, the survivors are still likely to be scattered all across China, or at least the eastern half, which still has an area of about 4 million square kilometers (greater than that of the entirety of India). The issues with choosing a city are also present for survivors looking to migrate, as Shanghai, Nanjing, Beijing, Hong Kong, Guongzhou, etc. are all major cities.
For Europe, this only gets worse. The area expands to 10 million square kilometers, and unlike India or China, which have their own capitals that could act as a rallying point, each country in Europe (which would probably have at most one survivor) would probably attract survivors to their own capitals. A single German survivor, for example, would likely head to Berlin rather than Paris.
So in summary: most survivors would probably be scattered over an incredibly vast area (hundreds of thousands to millions of square kilometers for a single person); if they decided to go to a big city to intentionally look for other survivors, there's a good chance they'd go to different cities than each other; and even if two survivors both decided to go to the same city, finding another person in even the same city is rather unlikely. 878