Probably China or India since they have a billion people.
Thus the biggest population times the chance of being left handed (which is roughly equal for each country) will give the largest number there!
Actually, contrary to the answer above, people in China are taught to be right-handed even if they prefer their left, so there are absolutely no lefties.
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The ratio of left handed people to right handed people is 1:10 and there are around 6,692,030,277 in the world, so that means that around 6 022 827 249 right handed people.
On average, right-handed people live about nine years longer than left-handed people.
They are unique
There are plenty of left handed people, so if you are left handed you'll probably meet another left handed person at some point. Approximately 10% of the population of the United States is left-handed. That means that of every encounter between two people, one in ten will include at least on left-handed person. To find out how many will be between two left-handed people, you multiply 10% by 10%, you get 1%, or one in 100, so the odds of a left-handed person meeting another left-handed person are 1 in 100. Your question doesn't specify "meeting for the first time"; encountering someone you already know changes things a little, since left-handedness can run in families. Also, those odds don't include meetings with more than two people, or research into facts such as there being left-handed conventions, or left-handed baseball pitchers tending to know one another. That's probably not a big deal, though, and there may be sports or occupations that favor right-handers, which balance things out.
24% are left-handed.