Assume there are approximately 5,000,000,000 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?
(If you cannot estimate the number, then try to guess how long the number would be.)
The product of the number of fingers on the left hand is zero. It only takes one person to have no fingers on their left hand for the product to be zero, because anything multiplied by zero is zero.
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