Assume there are approximately 5,000,000,000 (5 billion) people on Earth.

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Assume there are approximately 5,000,000,000 (5 billion) people on Earth.
What would you estimate to be the result,
if you multiply together the number of fingers on every person's left-hands?
(For the purposes of this exercise, thumbs count as fingers.)
If you cannot estimate the number then try to guess how long the number would be.

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The Answer is 'ZERO'
Some ppl on the earth would have no fingers on the left hand.
So any thing multiplied by 0 is 0.
Hence 0 is the answer.