ANSWERS: 3
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2/3 would be alive.
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Since I'm getting rated down for this question, I think maybe I should explain a little. I'm not trying to be morbid or anything, and I would never want this to happen to our world. I am writing a story (call it a novel if you will) and this is what it's about. I have Googled this, but didn't find the answers I was looking for. I thought someone on AB would have a good idea of an approximate number.
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About 4 billion.
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